What’s the best free file synchronization software for Windows?

File synchronization software comes in many shapes and forms. From cloud storage services that allow you to sync files with the cloud and from there to your other devices to local solutions that you use without third-party involvement.

This article concentrates on local solutions only that are offered for free and run on all supported versions of the Windows operating system.

While cloud syncing services have their advantages, it makes little sense to use them when you want to sync files in a local network between devices.

Before we look at the programs that we reviewed for this article, it is important to define what makes a good file synchronization software.


  1. Supports manual and automatic (scheduled) modes of operation.
  2. Supports one-way and two-way synchronization of data.
  3. Filters to include/exclude files or folders based on rules that you specify.
  4. Should sync files in use.
  5. Should work with a variety of devices including internal and external hard drives, network shares and removable devices.
  6. Should not limit you in regards to the synchronization (no file limits, use limits).

The Contenders

Bvckup 2 - Freeware

Create Synchronicity - Open Source Software

FreeFileSync - Open Source software

SyncBackFree - Free for personal use. (Portable version link)

SyncFolders - Freeware

Syncredible - Free for personal use.

Synkron - Open Source software

Not included

Allway Sync - Limits syncs to 40,000 files per calendar month

Bvckup 2


Bvckup opens a clean interface on launch., First thing you do is create a new backup profile under File and configure it.

There you select the source and destination folders as well as all parameters for the job. You will notice that you can only configure one-way sync operations using the program.

What sticks out on the other hand is support for delta-copying files which reduces the time it takes to update already synced files by transferring only the parts that have been modified.

The program can monitor the source directory in real-time, using specific intervals or manually. The preferences hold additional options of interest. It is for instance possible to link backup jobs to removable devices so that they are only run when the device is connected to the system.

The progress is highlighted in steps when a job runs. It highlights the current operation and the remaining steps and errors so far. A detailed log file is available as well which you can enable under options.

Create Synchronicity


Create Synchronicity is an easy to configure file backup and synchronization software. Compared to other syncing programs it is rather bare-bones which does not have to be a bad thing depending on your needs.

It does support one-way and two-way syncing though and a couple of additional features that you configure during setup of a new sync job.

It supports a preview option that displays exactly what will happen when you run the synchronization job. There is however no option to make last minute adjustments to the job which means that you will have to open the configuration of the job again to do that.

The sync dialog displays all there is to know about the process including the elapsed time, progress bars, the speed of the process and how many files and folders were created and deleted so far and how many are left.



Attention: The program ships with adware. Mystartsearch was offered during test installations and the only option to skip it was to switch from Basic (Recommended) to Advanced and remove the checkmark from the Install Mystartsearch box there before clicking Next.

FreeFileSync's interface leaves you puzzled for a moment where to begin. It is not really that complicated but a little bit of guidance would help out a lot.

What you need to do is add folder pairs that you want to sync using the browse buttons. Once you have added at lest one pair, you use the compare, filter or synchronize button to start a process.

Both compare and synchronize are configured with a click on the cog wheel button next to their buttons. Compare for instance compares all files in both folders based on their size and file time.

Synchronize on the other hand displays the sync methods supported by the program as well as other sync related preferences that you can configure there.

Please note that you need to run the program with elevated privileges as you may get access errors otherwise depending on the folders and files you select.

Compare loads all files and folders and displays them in the interface. FreeFileSync higlights which files are only listed in one of the two directories and displays the total size and file count of the operation if executed.

Scheduling is not built-in but you can export a job as a batch file and add it to the Windows Task Scheduler manually to run it regularly on the system.



Setting up a sync job is a two-step process in SyncBackFree. You create a new profile and the desired synchronization method in the first step.

Once done, you configure the new sync profile in detail in the second step. A simple version of the configuration is displayed to you by default. You can change that to an expert configuration if you prefer that which displays all available options (and some not available in the free version).

The expert options leave little to be desired. At the very least, it is necessary to add two folders to the profile but you can do a lot more than that.

For instance, it is possible to define detailed compare options that determine whether files are equal or not based no parameters that you can adjust in the settings.

Next to that, it is the only program supporting compression and encryption of files, and ftp servers. Another interesting and unique feature it offers is a performance estimation for the profile highlighting settings that may slow down the profile.



The program is probably the easiest to set up thanks to its streamlined interface. One you click the new button you are taken to the configuration screen where you configure all sync related options.

Before you run a sync operation, you may want to run a scan first as it provides information about the job. It lists files and folders to synchronize, the total size of the data and errors that it ran into.

A click on errors reveals those while details lists all files and folders and their status in regards to the other folder. A right-click on folders or files displays options to override the default rules in place. You can block files from being synchronized or copied for instance.



When you first start Synchredible after installation you are taken directly to the task wizard which you can use to create a first sync job.

Adding a new sync job is not complicated and every option that you can select is well explained. It takes seven steps (pages) to set up your first sync job which can be a bit overwhelming if you never used a sync software before.

The wizard covers all necessary information on the other hand giving you full control over the process. Here is a quick rundown of the steps:

  1. Select the two folders and decide whether subfolders should be included.
  2. Enable one-way or two-way sync, and decide if you want to synchronize all files or only newer files.
  3. Add more parameters such as deleting redundant files, ignoring hidden files or folders, or comparing file contents.
  4. Set up filters to include or exclude files or folders from the operation.
  5. Set up automatic tasks. Schedule synchronization jobs or configure them to run based on certain conditions or system events.
  6. Add actions that you want run before or after synchronization.
  7. Add a name, assign a system wide hotkey for the task, and enable the preview feature.

Jobs can be run manually at any time or only manually if you want that.Another interesting feature is the program's group option. You can add multiple jobs to a group to run all jobs of that group in one operation.

Before you run the first job you may want to check the program's options first as they list quite a few sync related preferences.

Verification is enabled for instance by default while the saving of reports is not. You can also mail reports, suppress error messages during jobs, change the buffer size or disable log file creation.

Sync jobs that run show the progress of the operation in the interface. There is also an option to pause the job.



Synkron supports folder synchronizations and multi-syncs. The difference between the two operations is that a folder sync is keeping files in sync between two or more folders while multisync syncing multiple source folders with one destination folder.

Once you have added at least two folders you can hit the analyze button to display information about the current sync status.

All folders not synced currently are listed for synchronization but you can blacklist files or folders to exclude them from the process.

Advanced options are available as well which you can use to define additional sync related preferences such as not creating empty folders or syncing hidden files and folders.

Once you hit sync all files and folders are processed and displayed to you so that you know exactly where the process is at. There is no progress bar on the other hand which means that you don't know how long jobs will take to complete.

Quick Overview of Sync Programs

BckupCreate SynchronicityFreeFileSyncSyncBackFreeSyncFoldersSynchredibleSynkron
1-way and 2-way sync1-way onlyyesYesyesyesyesyes
Removal devices supportyesyesyesyesyesyesyes
Network supportyesyesyesyesyesyesyes
Sync opened files yesnoyes yesnoyesyes
Synchronization rules yesnoyes yesyesyesyes
Sync previewsyesyesyes yesyesyesyes
Automationyesyesyes yesyesyesyes
Verification nonoyes yesyesyesno
Versioning nonoyes yesyesnono
Adware nonoyes nononono
OtherPortable, Delta-Copy, real-time syncPortablePortableCompression, Encryption, FTPCross-platform

Which program is the best?

This comes down to your requirements more than anything else. Synchredible overall made the best impression as it offers an immense number of options to set up synchronization jobs on your devices.

SyncFolders is another excellent program. While it may lack certain features, it makes up for them with its straightforward interface which is probably the easiest to use.

You cannot go wrong with both of them unless you require a specific feature that one of the programs does not offer.

Update: SyncBackFree is another excellent program that ships with a couple of unique features. It is probable the feature-richest program of all programs mentioned in this article.

If you don't require two-way syncing, then Bvckup may be another interesting choice. The program supports delta-copying which should speed up consecutive sync jobs significantly.

Other suggestions worth investigating:

Now You: Which program is your favorite when it comes to file synchronization on Windows?

Article Name
What's the best free file synchronization software for Windows?
An overview of the best free local file synchronization programs for the Windows operating system.
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Responses to What’s the best free file synchronization software for Windows?

  1. DonGateley March 17, 2015 at 8:37 pm #

    Do any of them support continuous real time operation as well as automatic at discrete scheduled times?

    • Martin Brinkmann March 17, 2015 at 8:44 pm #

      You can configure Synchredible to check every x minutes for files that need to be synchronized. It supports time/day restrictions on top of that.

    • MartinPC March 19, 2015 at 7:29 pm #

      FreeFileSync comes bundled with RealTimeSync. For real-time syncing, what you do is set up a sync job in FreeFileSync, save it as a FreeFileSync batch file, and create a shortcut to RealTimeSync with an argument that targets the FreeFileSync batch file. (The help instructions explain how to do this pretty clearly.) You can then put the customized RealTimeSync shortcut in your Startup folder. Once it is running, RealTimeSync monitors the folders referenced in the batch file for changes and, when a change is detected, it runs FreeFileSync in background.

      When RealTimeSync first starts, it has to enumerate files on the remote computer(s). Once that's done, file-syncing is reasonably prompt. On a hardwired Ethernet network, changes to a file on one computer usually show up on the other within a couple of minutes. On a WiFi network -- one using the older G standard, at least -- all FreeFileSync/RealTimeSync operations can take much, much longer. With one pair of computers I'm using FreeFileSync/RealTimeSync on, I circumvented that problem by making a direct Ethernet connection between the two computers. (Because at least one of them has a gigabit Ethernet port, I didn't even have to get a special crossover cable.)

      If the same file changes on both sides since the last sync -- e.g., you open, edit, and save the same file or download the same file to the same place on both computers nearly simultaneously, or while RealTimeSync isn't running -- a conflict is detected and FreeFileSync will not sync that file. Conflicts are flagged in FreeFileSync's logs, and I think you can probably configure error pop-ups for them as well. Resolving conflicts is easy. You run the batch file in FreeFileSync manually and click the Compare button. All the as-yet-unsynced files are listed, and the conflicted ones are flagged with a lighting-bolt icon. You indicate which direction to sync the conflicted files in by changing the lighting bolt to a right or left arrow and then you click Synchronize.

      Finally, you can set up your FreeFileSync batch job to back up any file deleted or changed by a sync operation, with or without versioning. And it's smart enough to recognize the difference between moved files, renamed files, and deleted files.

      I've been using FreeFileSync/RealTimeSync on a couple of small home networks for around nine months now, and while there was a learning curve in setting it up, I'm extremely happy with the results. It's satisfying to check in on the networks from time to time and find that everything is working flawlessly, with (mostly) zero conflicts and errors. The bundled adware business is distasteful -- they seem to be alternating between OpenCandy and whatever Martin mentioned in the article -- but if you get tricked into installing it (they got me once, on an update), Malwarebytes Anti-Malware free can probably take it out.

      • Martin Brinkmann March 19, 2015 at 8:51 pm #

        Martin thanks for sharing your experience with the software, it is very helpful.

      • Mike Cabolet September 28, 2016 at 4:26 pm #

        Why is it called free. All the programs I want to download tell me that I have to pay.
        Maybe it is only free when you write an review :)

      • A different Martin (the artist formerly known as MartinPC) September 28, 2016 at 6:54 pm #

        @ Mike Cabolet:

        FreeFileSync actually is free donation-ware. If you don't donate, you get installers with bundleware that you can opt out of. If you donate, you get clean installers. It's actively maintained and developed and updates seem to come out every three or four months or so.

        I've been using FreeFileSync for a couple of years now, on my own computer, on my dad's small home network, and on a friend's small home network. While it worked pretty well from the start -- with a single FreeFileSync batch file and a single RealTimeSync task to trigger it -- there were regularly conflicts that needed to be resolved manually, and the backup files generated by a sync weren't guaranteed to themselves get synced before, e.g., a laptop was disconnected from the network and taken somewhere else. It took me a little thinking and trial-and-error to learn to break up the syncing work into multiple FreeFileSync batch jobs triggered by multiple concurrent RealTimeSync tasks,* to fine-tune the triggering delay for each RealTimeSync task, and to fine-tune the exclusion filters. Now that I have, I rarely find any unresolved conflicts or "missing files." My dad and my friend don't do any manual sync maintenance on their own and it's probably been six months since I've seen any sync problems on their networks. As for my own computer, I've had maybe one conflict in that time. It was a huge, very slow Internet download that didn't download into an exclusion-filtered temporary file. The file synced halfway through the download, and when it tried to sync again after completion, it threw a conflict and I got a popup. It took me a minute to resolve, by running FreeFileSync manually and telling it to overwrite the half-completed file with the completed file. I can live with that a couple of times a year.

        * If you decide to maintain backups of the files you overwrite or delete via FreeFileSync (and you'd be either crazy or very short on drive space not to), at a minimum you should have two FreeFileSync batch jobs: the first for the files you want to sync, and the second for the backup files generated by the first job. I've reached the point where I have separate batch jobs for (1) "regular" data, (2) "big" (slow to save, download, or copy) data, (3) configuration files, and (4) backups. Actually, I have two sets of these, one for "All Users" files, and one for my personal files. Shortcuts to the RealTimeSync tasks for the "All Users" jobs are in the All Users Startup folder; shorcuts for the RealTimeSync tasks for my personal account's jobs are in my personal Startup folder. The smaller jobs run and complete much faster than one massive job does and they can run concurrently. RealTimeSync has a blind spot and doesn't see new, intervening changes to the folders it monitors while its FreeFileSync job is doing a run. The faster and shorter the run, the smaller the blind spot, and the fewer outstanding unsynced files after each run. Plus, you don't burden the CPU with scanning every synced folder on the computer when just a single personal data file has changed; only the personal data folders get scanned. Maybe it wouldn't make that much difference on a super-fast computer with SSDs, but on my old laptop with big, slow hard drives, the difference is very noticeable.

        Anyway, long story short, FreeFileSync and RealTimeSync can take some time to master and fine-tune, but once you do, it can result in blissfully thought-free, effort-free, error-free automation. Still, don't forget to run disk checks on your hard drives from time to time and to maintain periodic non-automatically-synced backups of all of your important stuff. Even if FreeFileSync/RealTimeSync is working perfectly, if something else takes out one or more of your synced folders, you're going to want that backup. (An apparent drive error took out one of my FreeFileSync Backups folders a few days ago. Luckily, I had backed everything up to an external drive the day before. Whew!)

  2. Gerry March 17, 2015 at 8:58 pm #

    I've been using SyncBack Free by 2BrightSparks for many years. Not sure if it relevant to this discussion but it has certainly served me well and might be worth a look.

    • Martin Brinkmann March 17, 2015 at 9:03 pm #

      Gerry, I totally forgot about it. Will add it asap.

    • Jeff March 18, 2015 at 5:33 pm #

      Same here. Once you get your profiles set up, it's a piece of cake, and works great.

      I set up all my individual profiles, then create a group profile and place all the single profiles into that. When I want to back up everything, I just run the group profile with a single click.

  3. RossN March 17, 2015 at 9:10 pm #

    I've always used Karen's Replicator. However it doesn't support 2-way synchronisation. That might be possible but would require two 'jobs' for the one folder path to be synched.

    • A different Martin March 13, 2016 at 5:15 am #

      I used to use Karen's Replicator for quick-and-dirty backup jobs. It was easy to learn and easy to use. I seem to recall that it was pretty fast, too. However, as you say, it doesn't do 2-way syncing, just copying in one direction and then the other (which isn't the same thing), and it doesn't detect moved or renamed files. More importantly, it's a 32-bit program, so if you have a 64-bit system with pathnames or filenames that exceed 32-bit limits, Replicator won't copy them. I have a special place in my heart for Karen (RIP), but I've had to stop using Replicator since moving to 64-bit Windows.

  4. DV March 17, 2015 at 9:11 pm #

    From the suggested list, FreeFile Sync seems to best suit my needs. Mainly because it's portable. It also has more functions than Create Synchronicity. I can get rid of the adware (which seems to be the price to pay for the gap).

    I don't want to off-topic, but I've rather been using Syncthing (https://syncthing.net/) for a year now. If one is ready to sacrifice a flat and neat UI and do a little configuration, it's just awesome. Plus it's open source.

  5. Anonymous March 17, 2015 at 9:21 pm #


  6. daBam March 17, 2015 at 9:23 pm #

    Just a small correction:
    Verification is available in FreeFileSync, too, but it needs to be activated manually by editing a configuration file (GlobalSettings.xml )
    This is described in the help file under "Expert Settings."

    • Martin Brinkmann March 17, 2015 at 9:41 pm #

      Thanks I modify the table.

    • A different Martin March 13, 2016 at 5:00 am #

      The author of FreeFileSync ("Zenju"?) is lukewarm about file verification because it relies on a Windows function that uses cached data, rather than two de novo file reads, for the comparison. Bottom line: synching takes a lot longer and you're not getting an absolute guarantee that the files are identical anyway. It might be worth it if you have unreliable storage media or unreliable network connections, but otherwise, it probably isn't.

  7. Hans March 17, 2015 at 9:51 pm #

    I have been using Mirrorfolder (http://www.techsoftpl.com/backup/index.php) for years. Don't want an other (and I have some! ;-))

  8. B. Moore March 17, 2015 at 10:26 pm #

    I've been using PureSync by JumpingBytes.com for a few years now...

    Great program, haven't had any issues.

    • Martin Brinkmann March 17, 2015 at 10:49 pm #

      Anything in particular that made you pick it?

      • B. Moore March 18, 2015 at 3:30 pm #

        I had been using SyncToy before that but I started to need it to do more.

        I picked PureSync cause it checked off every Requirement you listed above... but I'm not sure about #4. Never needed that feature so I am not sure if it can do that or not.

  9. jimbo March 17, 2015 at 10:31 pm #

    I've been impressed by FreeFileSync particularly the speed at which it compares and executes. Also the ability to so easily add filters from the results. It was crucial to recovery post-Pandagate while I was doing the Windows Monthly Updates !

  10. Tom March 17, 2015 at 10:31 pm #

    I use Bittorent Sync, since I don't need Requirement #1. It fulfills all other requirements specified in this article.

  11. webfork March 17, 2015 at 10:56 pm #

    I strongly suggest the unsupported beta of Bvckup (which is freeware). It does delta copying, meaning only sending over changes. Once you do the initial backup, no other backup program can compete, especially with large file sizes or encrypted volumes.

  12. webfork March 17, 2015 at 11:09 pm #

    Two things:

    DSynchronize - which is a bit blocky and dull but I've used it for years without issue - http://dimio.altervista.org/eng/

    Bvckup - unsupported beta, which is freeware. It does delta copying, meaning only sending over changes (much like Gadmin-rsync that you profiled back in 2012 http://www.ghacks.net/2009/12/26/create-rsync-backups-easily-with-the-help-of-gadmin-rsync/). Once you do the initial backup, no other backup program can begin to compete, especially with large file sizes or encrypted volumes.

    * Speed - dramatically faster than other options
    * Profiles - can setup multiple sync plans
    * Portable - with tweaks http://www.portablefreeware.com/?id=2655
    * Versioning, verification, sync open files ... not sure about network support or some of the other criterion you list.

    * Space hungry - creates file hashes that can take up a lot of room
    * Lacks the fine grain controls of some you've listed (but does support filters)

    The author is selling a supported version so much of the site is dedicated to that, but the beta is at https://bvckup2.com/ towards the bottom under the "download" icon.

    • Martin Brinkmann March 18, 2015 at 6:31 am #

      Thanks for your suggestion. I check out Bvkup right away and will add it to the list.

    • Max March 18, 2015 at 12:53 pm #

      I also use DSynchronize for some time, I am quite happy with it.
      The portable version works better for me, I'm using it to backup some hot folders on various external HDDs.

  13. Dan March 17, 2015 at 11:24 pm #

    I don't know if this fulfills all requirements, but I use Dsynch as my only local synchonizing app.

  14. Alek Davis March 17, 2015 at 11:32 pm #

    What about Microsoft SyncToy?

    • Tim March 18, 2015 at 1:27 am #

      Wasn't SyncToy abandoned by Microsoft about 6 years ago?

    • MartinPC March 19, 2015 at 7:42 pm #

      If you use SyncToy, make sure that both drives you're targeting are the same size, or at a minimum that the aggregate size of what you want to sync does not exceed the available space on the smaller drive. If you don't, SyncToy will copy what it can from the larger drive to the smaller drive, and then replicate what's on the smaller drive to the larger drive by deleting files from the larger drive.

  15. Kevin March 18, 2015 at 12:03 am #

    I vote for Sync Toy also, it's been around for awhile but still works great.

  16. sut March 18, 2015 at 2:51 am #

    This is a link for downloading the latest portable version of SyncBack free. Been using this link for quite a few years to update the program. In recent years, searching the web for information and a download link for the portable version of the program seems to lead down dead ends but fortunately the link below hasn't changed.


  17. Alex March 18, 2015 at 6:02 am #

    Dude you forgot Duplicati! You might have even picked it as your favorite.

    • Martin Brinkmann March 18, 2015 at 6:32 am #

      Thanks I will check it out. It seems more like a backup software though unless I'm mistaken?

      • Alex March 18, 2015 at 8:17 am #

        You're right it doesn't have two way sync, only one way backup.

  18. Tommis March 18, 2015 at 8:04 am #

    I've been using CobianBackup
    for years.
    Though I do use it to make daily - weekly and monthly backups in zip at 2nd locations (lan or ftp)

    For actually syncing when in lan I use FreeFileSync and via FTP SyncBack

  19. Dukislav March 18, 2015 at 9:06 am #

    My favorite is:

  20. jimmyjamesjimmy March 18, 2015 at 11:23 am #

    I'm also a big fan of viceversa pro, but i don't think it's free after 30days.

  21. Christian March 18, 2015 at 12:02 pm #

    CryptSync: http://stefanstools.sourceforge.net/CryptSync.html

  22. te March 18, 2015 at 12:17 pm #

    I've tried a few and like Bvckup2 best. http://www.bvckup2.com Very clean and throught through UI and very fast due to delta copying. The release version is not free but the last beta from before first release is available for free I think. But well worth the money. A drawback is that it only does what its name say: backup i.e. one way syncing, but that is all I need it for so I'm not complaining.

  23. olidie March 18, 2015 at 1:34 pm #

    For a very long time I have been using robocopy with yarcgui. Some time ago I tested syncback and was so convinced by the software that I bought the proversion. I cannot speak for the free version but pro offers great features that are very well worth the money. Once licence allows five installations which is generous.

  24. Pete March 18, 2015 at 2:18 pm #

    I'm looking for a 'backup' program that instantly applies changes I do on drive x: to drive y: (For example I change x:\name to x:\newname and the y:\name folder instantly gets also renamed to y:\newname.
    Can the Bckup real time synch do that?
    Few months ago I tried FreeFileSync and some others but they all wanted to re-scan the folders to sync them, which is not feasible for several TB of files.

    • olidie March 18, 2015 at 5:41 pm #

      I believe robocopy is capable of this. It would have to be started with user login and run in the background. It can be used to watch folders and copy changes. I am pretty sure that it will not just rename the target file but delete and copy the new version. Not many bakcup programs are capable of dealing with real renaming.

      Edit: this is what I found http://serverfault.com/questions/55733/the-job-and-monitoring-options-of-robocopy

  25. Maelish March 18, 2015 at 2:40 pm #

    Does anyone use these to manually sync their web sites?

    • Martin Brinkmann March 18, 2015 at 3:05 pm #

      I don't think those programs are the best option unless we are talking about Intranet sites. It might work for static sites on the Internet though, or if you run a regular backup of your database or complete server and sync that.

      • Maelish March 18, 2015 at 3:08 pm #

        Ok, I am looking for something better than Winmerge for wholesale updates.

  26. jfilesync March 18, 2015 at 6:58 pm #

    I like and I use JFileSync.

    Yes, its Java based but so what?

    It works good, it's reliable, it allows local directory and over the lan sync, it allows multiple strategies for file synchronization and imo it's very easy to use allowing a single job to sync multiple directories with multiple file naming exceptions. Also it's cross platform, it works on Windows, Mac, Linux, everywhere Java works! For me this is a must, I try not to use programs which are not cross platform.

    And Java is not a security risk provided you have disabled the browser plugin.

    Try it please and include it because I think JFileSync is a really nice free and open source utility that is stable and works reliably for many years and it deserves to be more well known.


  27. Leandro March 18, 2015 at 7:12 pm #

    Best COMPREHENSIVE backup tools ever:
    (command line, of course!)

    Featuring high compression and encryption
    - http://www.7-zip.org

    Featuring mirroring, speed and symbolic links support
    - https://technet.microsoft.com/en-us/library/cc733145.aspx

    • Holger August 22, 2016 at 2:07 pm #

      7-Zip does not syncronize data
      This post was not about backups but a way to keep data on several computer in sync.

  28. PhoneyVirus March 18, 2015 at 10:50 pm #

    I've always used Microsoft SyncToys and discovered Syncredible when I was looking at ASCOMP BackUp Maker. Maximum PC Magazine always recommending SyncBackFree for like the last 8 Years. Before I reached the bottom of the article I new what programs were worth trying one day and they were the ones you recommend.

    Reading the comments is worth it, thanks to the people that mentioned Zback | CryptSync | Duplicati | PureSync.

    Thanks for the Tutorial/Article Martin

  29. efriend March 19, 2015 at 12:17 pm #

    which one has mini panel? anybody Knows? (like goodsync)

  30. Guest March 19, 2015 at 8:35 pm #

    Pressed ctrl+f
    Typed dropbox
    Saw nothing
    Closed tab

  31. MartinPC March 19, 2015 at 8:58 pm #

    Condi? Is that you? [Bush administration National Security Advisor and Secretary of State Condoleezza Rice is on Dropbox's board of directors.]

  32. Kevin Dearing March 19, 2015 at 10:31 pm #

    I've used SyncBack for many years.
    I needed an ftp solution.
    It was one of the few that could sync via ftp.
    Very powerful and reliable.

  33. Saranathan March 19, 2015 at 10:36 pm #

    Very informative and useful article.

  34. beemeup4 March 20, 2015 at 12:47 pm #

    No love for Microsoft Briefcase? It's built-in to most versions of Windows. It's VERY basic though (think "Notepad" of sync programs) but it works for simple things.

    • LogicDaemon March 20, 2015 at 5:24 pm #

      not in windows 8+ anymore. And that's for the good! Some users confused it with normal folders and messed their files.

  35. freewareer March 25, 2015 at 9:24 pm #

    Kind of late, but wanted to see other options posted.

    I use FreeFileSync on a regular basis. Mostly due to its speed. Used pureSync until it started skipping files and corrupting data.

    Another one I use and really really like is DirSyncPro: java based, portable and with an amazing array of options, batch setups, etc. Give it a try. It's a little bit slower than FreeFileSync, but has saved me a lot of times.


  36. L March 26, 2015 at 10:24 am #

    Hey Martin,

    I think you should also check SyncThing ( https://www.syncthing.net/ )
    It is free, open source, actively developed and seems to lack no features ( http://en.wikipedia.org/wiki/Comparison_of_file_synchronization_software )

  37. David Winter April 4, 2015 at 6:01 pm #

    I am copying several TB of video data every month (PC to NAS storage systems). I have looked at many synchronization software packages, including Syncback.

    The main concern I have is data integrity. How do I make sure my data is copied fault-free? This is an issue especially when copying between different OS's and filesystems.

    After trying Syncback and Syncovery I went down the dark alley: I installed cygwin and now use rsync over SSH. rsync uses md5 checksums on completed transfers to ensure bit level integrity. This is something none of these software packages listed can guarantee -- unless they redownload the entire file after copying, doubling processing time. Syncovery offers such an option.

    Once setup, rsync is just unbelievably reliable. Couldn't be happier.

    • DonGateley April 4, 2015 at 10:11 pm #

      Are you using it on Windows or Unix? Have you given Grsync a try?

      There is a Grsync for Windows and I'm seriously thinking of giving it a go.

      • David Winter April 4, 2015 at 10:25 pm #

        Im using command line rsync via the "cygwin" toolset on Windows. It's quite daunting at first but after a few hours of fiddling I was able to set up a few simple scripts that make my regular copy jobs basically just a simple one liner I have to run.

        I wasn't aware of a windows port for Grsync -- I though it was Unix only. Will give it a spin tonight! Thanks.

      • DonGateley April 4, 2015 at 10:38 pm #

        @David: please let us know your take on Grsync.

        Another question: are you using a daemon to keep directories in sync automatically?

        @Martin: I'd sure love to see deeper levels of reply threading.

  38. G Moores April 17, 2015 at 12:29 pm #

    Can you confirm that any of these copy files that are in use? I have been using Create Synchronicity for a while but I've been frustrated by failures to sync important files (like Mail files in \AppData\Local\Microsoft\Outlook\) because they are in use. Thanks.

  39. gh May 14, 2015 at 9:06 pm #

    "You cannot go wrong with both of them"

    probably easier to read as: _either_ of them

  40. A different Martin July 20, 2015 at 7:58 am #

    Well, I recently added three pretty big virtual machines (ranging from 16GB to 24GB each) to my hard drive and I'm suddenly beginning to appreciate the value of having a sync utility that supports delta-copying, i.e., copying only the changed portion of a file rather than copying the whole thing from scratch. I still think FreeFileSync is pretty fabulous (especially for free software), but it doesn't do delta-copying. As a result, working in one of my virtual machines and closing it triggered RealTimeSync/FreeFileSync operations that took nearly an hour to complete, all told. (The virtual machine file got copied from my system drive to my clone drive and got verified; the previous version of the file got backed up in my system drive's backups folder; and the backup got copied to the clone drive and got verified.) Needless to say, I removed the virtual machines from my real-time sync job and created a manual job for them instead.

    It looks like there are a number of paid commercial products (e.g., GoodSync) that support delta-copying, and maybe BitTorrent Sync does as well, but I'm not all that enthusiastic about learning the finer points of a new program. For now, I can live with having to back my virtual machines up manually when convenient. And if I'm lucky, maybe FreeFileSync will do delta-copying in a future version.

    I might as well mention another thing I noticed about RealTimeSync/FreeFileSync while I'm at it: RealTimeSync seems to have a little blind spot. Normally, when RealTimeSync notices changes in the folder pairs it's monitoring, it triggers a FreeFileSync run to sync the changes. However, if any additional changes (to different files) occur while that FreeFileSync job is running, RealTimeSync either doesn't notice the new changes or doesn't queue them up and trigger a subsequent FreeFileSync run for them. They will only be picked up the next time a change occurs while FreeFilesync is not running (or the next time RealTimeSync is started after being turned off). The practical impact of this blind spot is that if you need to be absolutely certain that everything on a "target" drive is properly synced and up to date before you eject the drive or shut down, you should run the FreeFileSync batch job manually just beforehand.

  41. imkdm August 17, 2015 at 8:32 am #


    I used to use "FreeFileSync". However, after some time I noticed that some of images started getting corrupt (blank black image, when I open them). Also, some of my excel files are also corrupted (even if excel auto-recover contents, it contains all symbols and irrelevant content).

    Has anyone came across such issue? I think this problems pertains to files in deep directories. Have you checked all of above softwares for data corruption issues and deep directory files sync success? I now use plain backup software.

    • A different Martin August 17, 2015 at 4:09 pm #

      I personally use FreeFileSync (1) to sync my laptop's data files in "real time" (actually with a short delay) to an internal resident clone drive (a bootable backup system drive), (2) to maintain versioned backup copies of all the files that FreeFileSync updates/replaces/deletes when syncing to the clone drive, and (3) to maintain an external backup of most of my system drive. With my set-up, I almost never have reason to try to load the copies FreeFileSync makes on my resident clone and external backup drive, so I'm not a good benchmark.

      However, I have also used FreeFileSync to sync data between two different computers (e.g., desktop and laptop) whose users actually do routinely access the same data files on both computers. To my knowledge, they haven't run into any corrupted files after a year or so of frequent syncing. (And if they did, versioned backups would hopefully offer a recovery path that isn't too painful.) Incidentally, one of the people I set this up for has deeply nested folders, long paths, and long file names, to the extent that it caused problems with 32-bit copying/backup programs.

      Had you turned copy verification on in FreeFileSync's global settings XML file? For an installed (non-portable) Windows version of FreeFileSync, it's done in:


      where you change:

      VerifyCopiedFiles Enabled="false"/


      VerifyCopiedFiles Enabled="true"/

      Copy verification significantly increases the time required to sync (roughly doubling it), but especially if you've had trouble with corrupted files, it's probably worth it. I haven't thought out the real-world implications on a heavily trafficked corporate network, but I feel like the developers should probably have exposed the global copy-verification setting in the program's main interface (Tools > Options) instead of making home users dig for it in a configuration file, and possibly add separate copy-verification settings for batch jobs and individual folder pairs. As FreeFileSync's help section on Expert Settings explains, copy verification relies on system features external to FreeFileSync and cannot be relied upon 100%, but it's probably better than nothing.

      Anyway, the short answer is that, to my knowledge, the FreeFileSync routines I have set up haven't resulted in any file corruption so far, including in deeply nested folders. I hope this isn't a case of ignorance being bliss...

      • Bill September 1, 2015 at 11:42 pm #

        Hello "A different Martin",

        I am intrigued by your FreeFileSync setup .

        Can you please elaborate on the paths and setting you use to set up to :

        (1) to sync my laptop's data files in "real time" (actually with a short delay) to an internal resident clone drive (a bootable backup system drive),

        (2) to maintain versioned backup copies of all the files that FreeFileSync updates/replaces/deletes when syncing to the clone drive, and

        (3) to maintain an external backup of most of my system drive.

        I would really appreciate some helpful pointers because I find FreeFileSync brilliant if I coud use it to achieve what you have done with it.

        Thank you very much.

      • A different Martin September 3, 2015 at 5:06 am #


        The answers to your questions turn out to be pretty involved. I'm working on them and will post when I've completed them (hopefully in the not-too-distant future).

      • Bill September 3, 2015 at 11:05 pm #

        Hello "A diffferent Martin"

        Perhaps you could create a Udemy course about it.

        I am happy to provide you with almost any instructional videos from Udemy on how to do that.


        Let me know here if you are interested and I will get those videos to you.

  42. Joey Fattone September 14, 2015 at 7:01 am #

    You can also check organyze file synchronization software. It can be downloaded for free from this link


  43. Chris Duv November 13, 2015 at 3:27 pm #

    Many thanks Martin Brinkmann for the “Update: SyncBackFree is another excellent program that ships with a couple of unique features. It is probable the feature-richest program of all programs mentioned in this article.”
    I had been using SyncFolders, which is a really pleasing Sync Program to use, but it could not detect that copies with a different creation date were the same files, and went and did damage deleting or double copying files for lack of discernment.
    Those “extra features” in SyncBackFree made it a delight to specify date of Creation as “ignore files Created before/after … date ddmmyy”, along with several other features which will travel a long way.
    High on my list to donate or subscribe at first opportunity to do so.
    Thanks to others who recommended SyncBackFree. Am not sure how its cometitors stack up, but that one comment was a lead I needed to look no further.
    GBU all, Chris

  44. Ping November 30, 2015 at 2:54 pm #

    Can you suggest and publish an article on tools that backup to cloud? Becaue cloud is popular now.

  45. Jiranz December 19, 2015 at 11:53 pm #

    Synchredible Pro version 5001 (subscription). I run several vm on a commercial server (raid configuration). In addition we have a redundant workstation syncing client data files minute by minute to an offsite storage using Synchredible. The workstation was running winxp pro sp3 and everything worked perfectly from Synchredible 4.xx onwards. It was on a timer so it shut down at 2am and restarted at 7am. One day it remained running and we found that Synchredible faulted at 1.5 days due to a memory issue which was not a problem for us with our routine schedule. The benefits were significantly greater than the issue so we continued using Synchredible.

    Then we upgraded the workstation to win10 pro and immediately had fatal errors in Synchredible.
    The main problem is it doesn't sync open files in win10 but it does in winXP. Since the advent of affordable uncapped broadband, more customers are opting to remain permanently logged in to the server and working on their files, saving their work as they go, but leaving them permanently open. As a consequence, those relevant clients files are are never being updated to external storage anymore.

    We have investigated all possibilities we can think of relating to Win10 and have had discussion with the developer of Synchredible who is at a loss to know what to do. We offered our support to find a solution but the developer said he cannot afford (not enough money) to find a solution and recommends we look for a replacement program.

    In summary I have to say that Synchredible was an excellent program and I am disappointed that we can no longer use it for the above reasons. Others may never experience these issues.
    Anyways, that is how I got to this discussion forum in the search for an alternative program. Thank you all for such an open and robust discussion forum.

    • Andreas Stroebel January 4, 2016 at 5:29 pm #

      Just wanted to let you know that we are about to release a new version of ExclusiveFiles add-on which should fix the rare Windows 10 issue recording to the developer. As I mentioned, the add-on is a third party add-on, that's why we were not able to offer a bugfix faster.

      Please just contact us at support@ascomp.de if you want to get informed as soon as the update is available, thank you!

      @ghacks: Thank you very much for your review and this great blog! Keep up the good work!

  46. Nick January 7, 2016 at 4:22 pm #

    The default Windows Server Backup feature provides a very basic backup and recovery solution for computers running the Windows Server (2003, 2008, and 2012). Cloud based repositories have become very popular in recent years due to their constant availability but unfortunately lack some automation and data source flexibility. GoodSync is a simple hybrid software that can backup or synchronize any amount of files and/or folders onto any devices (local or remote) in your enterprise. From one interface you can pull the data from all the sources in your company and push it to multiple destinations including machines on the same network, remote servers, NAS devices, and even cloud based data storage accounts. Here is a download link for Goodsync http://www.goodsync.com/download/GoodSync-Setup-Enterprise.exe

  47. yet another Martin March 12, 2016 at 7:29 pm #

    I am using Synchredible Pro and love to have the possibility to use the syntax of Win32 File Namespaces to overcome the MAX_PATH limit of 260 characters.
    My MP3 files have rather long names and the backup path on my NAS sometimes exceeds this limit. If I have mounted my NAS on Z: the path could be written as "\\?\Z:\very long path\" to use approximately 32 K of characters for the path (background info here: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx ).

    This is an important feature for me. I only found a hint at PureSync (suggested by B. Moore) that the tool supports long path names.

  48. Fry March 31, 2016 at 7:47 pm #

    synctoy- had issues with not being able to mirror, ie no deletes at destination.
    freefilesync works fine but lost the love with the adware
    Bvckup(free beta) kept producing errors with a difficult workaround of creating multiple profiles
    Syncbackfree looks good so far.

  49. Antonio April 16, 2016 at 11:39 pm #

    Hi everybody! I have a question concerning a sync app with some particular features that I could not find yet. Maybe you can help me find it.
    Is there any file sync software that allows to pair folders between 2 remote PCs, that works by tracking the changes made to files during a working session in PC 1 (at work), temporarily upload new files into a cloud storage space by for example pressing a button just before you leave the office and turn off the pc, and once you start a session in PC 2 (later at home) be able to accept file changes and start sync. I find this idea useful to keep my everyday working folders up to date between home and work, without the need to have them both powered on simultaneously along the whole day, and at the same time being safely in the way that it allowes checking upcoming changes before syncronization.

    • A different Martin April 17, 2016 at 9:30 am #

      I'm pretty sure you should be able to do this with FreeFileSync. (I haven't used it with cloud storage, but it supposedly works with that.) However, FreeFileSync has a bit of a learning curve, especially in its finer details, and if you don't thoroughly test your job (by clicking "Compare" and carefully checking the projected results) before actually running it (by clicking "Synchronize"), you can cause a real mess.

      Of course, before running any kind of sync program, you want to make sure both computers' time/date clocks are set to the same date and time. (Regularly syncing both to Internet Time should be good enough; I think FreeFileSync's default is to ignore time differences of less than 2 seconds.) Unless your office and home are in different time zones, you won't have to worry whether your OS stores files using UTC time. (I think most modern OSes do, but I can't swear to it.)

      I also think that unless you have ample cloud storage space and a very high-bandwidth connection, you'd want to keep the number/size of files in your paired folders reasonably low, maybe populated only with relatively recent files that you are actively working on. Otherwise the initial sync could take a long, long time, and you'd be wasting potentially costly cloud storage space on inactive files. In this connection, I wonder whether using a USB3 thumb drive might not work at least as well as using the cloud. There's definitely no reason you couldn't sync your computers via a thumb drive using FreeFileSync, and if you use the thumb drive's volume label (e.g., [ThumbDriveVolumeLabel] in your job's folder-pair list instead of a drive letter (e.g., F:) -- which could change depending on what else was already plugged into the computer -- you couldn't accidentally sync with the wrong drive. (Well ... unless you unintentionally assign the exact same volume label to a different drive or thumb drive.)

      A couple final remarks about FreeFileSync:

      (1) If you use a FreeFileSync batch job to do your syncing, you have the option of having it automatically shut down your computer once the sync is complete. In that case, you'd need to have two nearly identical versions of the batch job: one to use when you start working on a computer, that doesn't automatically shut the computer down, and one to use just before you take off, that does. I wouldn't do this until your batch job is thoroughly vetted and rarely generates errors, and you are sure nothing else causes the shutdown to hang.

      (2) You also have the option of having your FreeFileSync batch job run automatically in close to real time, whether you're syncing to the cloud or to a thumb drive. What you would do is set up a RealTimeSync task paired to the FreeFileSync batch job. Whenever you save a new or modified file, or delete a file, or rename a file in a targeted folder, your RealTimeSync task would detect the change and automatically run FreeFilesync. (The default delay is 10 seconds. You can edit this.) As with the automatic shutdown option, you wouldn't want to use RealTimeSync until your FreeFileSync batch job has been thoroughly vetted.

      My guess is that there are simpler solutions than FreeFileSync out there. Just copying your most recently edited files, or the entire folder containing them, to and from something like Dropbox or Google Drive might be easiest of all, especially if you use something like TeraCopy to do the copying. Taking the time to learn FreeFileSync is definitely worthwhile if you're going to be using it for more extensive and elaborate syncing tasks -- I have eight concurrent RealTimeSync tasks (running eight different FreeFileSync batch jobs) set to automatically start at logon -- but for syncing a single folder or even just a few folders between two remote computers, I would check out other commenters' suggestions first. Hopefully there will be some...

  50. yet another Martin April 17, 2016 at 3:37 pm #

    Hi Antonio,
    I am seconding what a different Martin says. If the computers clocks are in sync TeraCopy or similar can do the job.
    I am using FastCopy (a competitor to TeraCopy in fast copying) for those tasks. It is free (http://ipmsg.org/tools/fastcopy.html.en) and has some options how to operate the files (sync, copy, move, some diff modes).
    You can chose to preview the actions and estimate the time the actions will take. You can define postprocessing commands (standby, hibernate, shutdown, run command).
    I think it could be what you are looking for.

    • A different Martin April 19, 2016 at 12:30 am #

      @ yet another Martin

      FastCopy looks like a really good find -- it looks like an impressive (and impressively well documented) utility. One clarification to the documentation, though: what FastCopy calls "syncing" is what most of use would consider "mirroring," as it deletes files/folders in the destination that do not exist in the source. I downloaded the 64-bit installer (no malware or PUPs detected) and am definitely going to give it a try. Thanks for bringing it to our attention!

  51. Gareth April 20, 2016 at 2:23 pm #

    I use PathSync.


  52. Bassthang! May 21, 2016 at 11:24 pm #

    Thanks for a great article Martin! It's refreshing in this age of "web-stuffing" to be able to find a comparison review that is properly researched and well-written, by someone who appears to know the subject.
    I'm here because I want to research software for syncing computers to a NAS. The NAS came with its own sync software, but that defaults to hiding the synced folder in some hidden "user" folder on the NAS. We want something that produces a synced folder that can be read from any attached machine, in a location of our own choosing.
    Some of the tools reviewed here (and mentioned in the comments) may do a better job, so I'll test them out.

    A review of FreeFileSync on another site (I think it was on the Sourceforge download page) mentioned that FFS changes the time and date stamp on files and folders to the time of sync. If so, that would be a deal-breaker for us.
    Has anyone experienced this?

    • A different Martin May 22, 2016 at 10:14 am #

      After taking a look at the forum post you appeared to reference -- http://www.freefilesync.org/forum/viewtopic.php?t=2155 -- I ran a FreeFileSync test in Windows using date-and-time comparison and two-way syncing. Do not count on these results to apply to other comparison and syncing methods (or to other OSes?).

      New folders created on one side as the result of a sync kept the original folder's "date created" timestamp but had a different "date modified" timestamp corresponding to the time of the sync.

      The same was true for folders that already existed on both sides before a sync but that were "modified" on one side by having new files added to them. The folders' "date created" timestamps remained identical, but the "date modified" timestamp of the destination folder was the time the folders were synced, not the time the source folder was last modified.

      New and modified files kept the original files' "date created" and "date modified" timestamps.

      Discrepancies in folder "date modified" timestamps have never been important for my purposes -- keeping clone drives mostly up to date between clonings, and syncing data files and certain configuration files between networked computers-- but I can imagine they might be in some circumstances.

  53. Peter Petit July 18, 2016 at 3:25 am #

    I've been using FreeFileSync, which I like, except for one simple issue.

    Whenever I have Quickbooks running during a sync, FreeFileSync stops with a warning message the the Quickbooks Company file is open. This usually happens when I'm sleeping, hoping that the sync will be completed when I wake in the morning. Instead, I find an open messagebox waiting for me. So I close Quickbooks, press "Retry" and let the sync process complete itself (usually another few hours, based on my practice of once-a-week syncs).

    Your table says "Yes" for "Sync Open Files". Perhaps I haven't found the setting that allows FreeFileSync to do this.

    • A different Martin July 18, 2016 at 10:30 am #

      Hmmm. Is it necessary to leave Quickbooks open during syncs? Do you run your syncs on a schedule?

      The option to copy "open" (locked) files is among the FreeFileSync Global Options that are available in the GUI, under Tools, Options, Copy locked files. In my experience, copying locked files generates synchronization conflicts that need to be manually resolved in a subsequent manual sync, but maybe it was just the type of files I was using. (Sorry, but I don't remember the details -- I quit syncing locked files quite some time ago.)

      If you're running your sync job as a simple (non-batch) job, there should be an option in the job's Synchronization Options that allows you to select how you want errors to be handled: Pop-up [and wait for further instructions], or Ignore. If you're running your sync job as a batch file, there should be an option in the "Save as batch file" dialog that allows you to select how you want errors to be handled: Pop-up [and wait for further instructions], or Ignore, or Stop. If you choose "Ignore" in either type of job, or "Stop" for batch jobs, you are going to have to run a manual Compare later on and manually Sync any stragglers (possibly after manually resolving any conflicts).

      I don't know whether you're syncing other files in addition to Quickbooks data, but if you are, you might also consider making your Quickbooks sync job a separate batch job from the rest. In this case, you would probably want to store your Quickbooks data in a folder that is outside the other data's path (e.g., C:\Users\YourName\My Quickbooks Data instead of C:\Users\YourName\Documents\My Quickbooks Data), to avoid directory-locking conflicts. That way, you can run both jobs concurrently, and if the Quickbooks sync hangs for any reason, it won't interfere with the other job.

      Also, you may be able to write a command-line batch file that starts Quickbooks and then starts the FreeFileSync Quickbooks data batch job. You'd start Quickbooks using the custom batch file and then (in theory), when Quickbooks exits, the batch file you started Quickbooks with would go on to run the FreeFileSync batch job. It would be more elegant to use Task Scheduler to run your FreeFileSync Quickbooks Data batch job, but I don't know whether it's possible to set up a Quickbooks program exit as a triggering event.

      Finally, you can use a RealTimeSync job to monitor changes to your Quickbooks Data folder and automatically run your FreeFileSync Quickbooks Data batch job whenever a change is detected. So long as a change is made to at least one of the files in your Quickbooks Data folder when Quickbooks exits, your FreeFileSync batch job would run automatically when Quickbooks exits. (If you want to avoid syncing during the day because of network congestion, I'm sorry, but I don't remember if there's a way to lock out certain times of day inside FreeFileSync and RealTimeSync and I'm too sleepy to look it up. I suppose you could always use Windows' Task Scheduler to run the RealTimeSync job between x o'clock in the evening and y o'clock in the morning or something like that).

      I hope at least some of this was helpful.

  54. p-i-n-o July 22, 2016 at 11:34 pm #

    Hi. Please also give Parsley file sync a try:


    • Don Gateley July 23, 2016 at 9:40 am #

      I'm tryin'. Tried everything else and found all wanting. I had to uninstall all versions of Python 3.4.x that were on my machine to get it to install Python (Javascript, my man, Javascript) and now nothing happens when I click on the executable or a link to it.

    • Don Gateley July 25, 2016 at 9:13 pm #

      Hello? I hope this wasn't just drive by spam.

      I got past the install problem by re-installing Python and then parsely. Now when I start a sync the window interface emits the Python command that starts it and then just hangs. The manual, more a dissertation than a user manual, affords me no help.

  55. p-i-n-o July 26, 2016 at 10:51 pm #

    Hi. Spam? It depends... It was an announcements for a free software project, which somewhat matches the page topic ;)

    What does it exactly mean when it 'hangs'? Is the window frozen? I see it your screenshot that the sync button is disabled, so yes, maybe there is actually something hanging... How long did you wait? Is it possible that you just gave it a large job? It can imagine that the current version's user interface behaves somewhat clumsy while busy. Could that be the case? I just dreamed away for a minute back to times when my filesystems had a drive A: and using it made enough noise for the entire flat... But I'm not sure if your drive A: is also limited to 720KB :)

    Weeell, yes, the manual is maybe something you never get right for everyone :-/ I'm actually a bit glad to have a documentation at all. It is neither complete, nor perfectly structured everywhere, probably written in poor English at (many?) times and maybe also, ... how do you call it? ... more a dissertation. I love that, since I never felt smart enough to write an actual one :) But what do you mean exactly? Too verbose? Or too less meaningful? At which places? I'd like to get more details, if you like to write them down. I can't promise you to takeover all your suggestions of course, but, sometimes it is hard for a developer to see where the actual questions and problems are. The user has really a different position and sometimes has to tell the developer about it ;)


    • Don Gateley July 26, 2016 at 10:59 pm #

      Your response removes it from spam suspicion. :-)

      Yes, after emitting that first line to Python when I click Synchronize it does no more. The window remains responsive but there seems to be no activity.

      I think that what is written is excellent. Especially for someone interested in how it was done. Problem is, it doesn't address the user that just wants to get it to work and be able to use the options. A distillation from what is written would be appropriate for that.

      • p-i-n-o July 26, 2016 at 11:25 pm #

        Can you check in Explorer, if some syncing takes place after you triggered it and while the graphical user interface keeps that silent? This is at least my best guess so far :)

        If so, then I keep two things in my mind for the next days when I have some time and fun and the developer tool opened:

        a) Write something more in the manual for the first steps.
        b) Make the GUI give some progress information while syncing; not just afterwards.

        While (b) is clear to me, I will have to think more about (a). When you ignore the technical issue with the Python installation for a moment, and also imagine that the GUI gave you some progress feedback: Were there any places on your way which brought you actually into trouble? My hope was, that the very basic operation (i.e. what the default config does) is possible completely without the documentation at all...

      • Don Gateley July 27, 2016 at 10:31 am #

        Well, it wasn't dead, it just looked that way. When I took the machine hosting the network drive down it spit forth a lot of Python stuff and said it had stopped. I restarted it. Thing is, even if it is running it isn't doing any syncing. I delete a couple of directories from one side and nothing happens to the other.

        Yes, showing indicators of active operation is very important.

        Yes, whatever the Python issue was it was incidental and transient.

        What I am suggesting for a document is the document you have but reduced to the essentials for operation. Presented in a logical way. Everything behind the "Change" button must be explained but in a purely functional way. What the options mean is imperative and if some of them are for specialists only, they should be hidden another level deeper. That's an implementation issue as well as a documentation issue.

  56. Joseph Huddleston October 18, 2016 at 8:36 pm #

    Thank you for your great article.
    I understand that the products reviewed in this article work when the files and folders are on the same LAN.
    Are you aware of a product that will allowing synchronization two folders across the internet.

    Thank you,
    Joseph Huddleston

    • DV October 19, 2016 at 1:28 pm #

      I've been using Syncthing for this purpose since it's beta, and it's working quite fine.

  57. ChrizK November 1, 2016 at 9:43 am #


    My requirement is mainly to sync photo and video files from my laptops to/from my NAS (Synology).
    I mainly copy photos to one laptop, with the intention to backup (sync) to NAS, and then sync to another laptop.
    (photos are the most important files for me)
    The complication ...the missus ... she wants to be the authority in charge of what gets deleted. The problem being, she rarely does it! This is a real pain, as I want to rename the files to reflect the date, but I don't want to bother doing this until the unwanted photos are deleted.
    So, I need to be able to copy to the laptop > sync to NAS > delete (eventually) on laptop > (interim sync to NAS) > rename on laptop > sync to NAS

    The deletes should be easy enough for sync software to handle if I do an interim sync, but can any software handle this if I do not (delete and rename files before syncing)? The 'easy' option is to delete everything and then sync, but obviously that is very inefficient, especially now image files have become so large (even more so if I apply the same process requirements for video).
    A variation of the question is, can any software handle renaming files without deleting the destination file and (re) copying the renamed file?
    I am sure this can be handled with checksums, but would this be incredibly slow?

    Of course, this can become a lot more complex if I wanted two way replication, perhaps using two laptops as sources (NAS as destination). The potential is to call files the same name, and so the software would have to spot conflicts and give options to rename.

    I have been wanting software to do this for years, but to be honest, it has probably been literally years since I have had time to try things out (downloaded Synctoy some time ago, but just haven't had the time). That is what having kids does ...which also increases the photos and videos!

    Any help would be much appreciated.

    Thank you

    • DV November 1, 2016 at 11:06 am #

      Seems like Syncthing is what you need. A bit fiddly at the beginning but it runs nice afterwards.
      I've set it up on all my devices - including a Synology NAS and a laptop.
      An example : any picture I take with my phone is automatically backed up on the laptop and the NAS. Any file operation (renaming, deleting, etc.) is mirrored as such.

    • A different Martin November 1, 2016 at 9:19 pm #

      FreeFileSync can handle file moves (within the same synced parent folder) and file renamings without deleting and recopying. The exception to this is if one of its sync databases gets corrupted. In a couple of years running a total of maybe 50 or so folder pairs in 8 different batch jobs, this has happened to me maybe a couple of times. I don't even remember the circumstances. On a friend's system, it happened once, apparently after a bizarre interaction between his antivirus and a defrag utility wiped out a bunch of folders, including ones where FreeFileSync databases were stored. (He had backups and was able to fully recover.) When a FreeFileSync database gets corrupted or needs to be rebuilt from scratch, you might end up with two copies of the same file, one with the old name and one with the new name. In that case, a utility like Ashisoft's Duplicate File Finder usually makes quick work of the redundancies. Or, you might end up with some recently edited files where FreeFileSync doesn't know which version to keep. In that case, the one with the later date and time is usually the keeper (and the one to sync from), but you might want to open both versions to make sure.

      But I digress. FreeFileSync's databases don't get corrupted very often and in practice you can delete, rename, and move files to your heart's content and your source action will be replicated in the target location (with the caveat that, for moves, the move must be to a synced folder -- you can't move a file from Folder A, which is synced, to Folder B, which isn't synced, and have the file magically show up in Folder B on the other side). If the move is within the same synced folder pair, the move will get replicated with no deleting or recopying (just a renaming of the file's pathname). If the move is between two different synced folder pairs, the "move" will get synced, but it will involve a a deletion and a recopying.

      Regarding the possibility of two different photos with the same name, one originating from each computer, I believe FreeFileSync would flag a conflict regardless of which file comparison method you use. You would then have to resolve the conflict manually, by renaming one of the files. (Run a manual compare and sync of the job in FreeFileSync's GUI to display conflicted/unsynced files; open each conflicting pairs of photos to confirm that they're different; rename one of each pair; run another compare and sync.) Would this whole problem might be obviated if you and your wife always included your respective initials and a unique camera identifier in the file names of the photos you take?

      Using FreeFileSync, it sounds like the best solution for your situation (where I gather both laptops won't necessarily be hooked up to the NAS at the same time) is to run FreeFileSync from both laptops. If both laptops have identical data-file folder structure (tree/hierarchy/paths) for photos -- say, if you store them in C:\Users\Public\Pictures rather than in C:\Users\[YourName]\Pictures -- you could even use identical FreeFileSync jobs or batch jobs on each laptop. If your folder structures are merely similar (e.g., only the Windows personal folder names differ), you could adapt them from one laptop to the other with minimal editing, as simply as doing a global search-and-replace in each job's XML file. As always with FreeFileSync, test your jobs/batch jobs thoroughly by running compares without actually syncing until you are certain they work the way you want. And if you have the storage space to spare, it's a good idea to maintain at least one automatic backup of any file deleted by a sync. Finally, once you trust your FreeFileSync routines to almost never screw up in any significant way, you can make autostarting RealTimeSync tasks for them, and when you connect to your NAS, they will run automatically without any action on your part. There's a learning curve; you have to be mindful when setting up your options and jobs; you have to vet new jobs carefully before actually running them; and you have to be mindful about changing folder structures afterwards. But once you've got everything set up the way you like it, it's pretty much effortless.

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