WilSync is a FREE front end to the windows cwrsync programs. Rsync is a system which synchronizes files and directories from one location to another while minimizing data transfer using delta encoding when appropriate. An important feature of rsync not found in most similar programs/protocols is that the mirroring takes place with only one transmission in each direction.
Wilsync is designed to run on a USB drive so, you can easily back up your work documents, go home and retreive the changed files and work at home. Then, of course do the reverse when your done at home: run wilsync to back up your changes. When your back in the office, run restore and it will bring the changed files to your work computer!