Versionbackup is a little free for personal use (single pc) application that lets you backup files according to a schedule that you define in the program. It would be possible to load the program at windows start and let it backup the file right after windows started for instance.

Enjoyed the article?: Then sign-up for our free newsletter or RSS feed to kick off your day with the latest technology news and tips, or share the article with your friends and contacts on Facebook or Twitter.
Related Articles:
Version Control And Backup Software AutoVerUsing GFI Backup Free Edition to Backup Files to an External Drive
Automatically backup your files
Backup important files to FTP
Backup Utility, Backup Windows User Profile Data

I tried this out. It is interesting but I was surprised to find that it does not offer a continuous backup facility. What I needed was the ability to take automated backups of all my code as I work on it and have access to every single modification.
After much searching I have found something that does just that
http://www.etkit.com
In the bargain it does a lot of interesting side lines such as file comparison and folder tracking.