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.
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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.