FileHamster

FileHamster is a version tracking application for developers, graphic artists and other content creators that frequently modify existing files.
FileHamster provides real-time backup and archiving of your files while you work.

It enables you to monitor specific files on your hard drive and automatically create incremental backups whenever those files are modified. It also enables you to store notes about the changes that have been made, allowing you to quickly locate a specific revision or provide a detailed account of the work you've done on a project.
It has many features, but is very easy to use and does not require any technical expertise - just point it to the directory or file you want to backup and it will do the rest.
Also, with a powerful plugin architecture built in, FileHamster can be expanded to meet the needs of any user. Find several free plugins at http://www.filehamster.com/Downloads/ and watch for more powerful solutions to come in the future!