Doppelganger - description from Softdepia.com:
Doppelganger is a backup and restore utility that sits in the system tray and protects against the loss of important data in the event of a disk crash by copying selected files and folders to a second hard drive, removable drive (eg Zip Drive) or network drive at user configurable time intervals. Optionally, Doppelganger can perform backups during Windows startup and shutdown. Selection of files and folders is achieved using drag and drop operations.
Doppelganger is a "Free to try" program. You can download and try it for an evaluation period.