AJC Active Backup
AJC consists of two modules. There's a backup applet that sits in the system tray waiting to backup files in locations you specify and a viewer module that lets you browse the revisions of documents added to the program's proprietary .aja compressed archive files. The program performed well in my testing, though it didn't offer to copy previously archived files when I changed the backup location. It did however, keep track of files that were changed while the backup destination was unavailable (my NAS box was off) and copy them when the location became available again.
My only other wish is that AJC would back up to multiple locations. I feel better when I know my current articles are backed up both to local storage and something remote on the other end of the network.
--Jon L. Jacobi