FileHamster is a free utility that performs automatic backups of any directory you select. It also keeps track of any revisions you've made. You can insert comments with each version and go back to previous versions of your work.
It looks like the program was designed with artists in mind, but it should work with any files that you regularly update. There are also a number of plugins for storing your backups in a Zip file, providing a log of your backups, or adding detailed notes for each revision.
[via lifehacker]
