SyncMate can also:

Sync Mac with any mounted device

Personal data, images, music, folders, online backup, and more!

Back up personal data
SyncMate will back up Mac Address Book and iCal entries (Free edition), bookmarks, To Do/Reminders, Entourage and Mail notes (Expert edition) on any mounted storage device.
Sync any mounted device
SyncMate will sync Mac with any mounted storage device - Mac partition, portable USB storage, locally connected disk, FireWire hard disk drives, devices connected via USB, etc. Automatic sync is available!
Sync media files
Keeping your images, music and videos synced between Mac and any mounted storage device is as easy as one, two, three with SyncMate. SyncMate will detect mounted device automatically once it is connected to your Mac.
Download Free version Buy SyncMate Expert
SyncMate is compatible with Mac OS X 10.5 and higher
Sync your mobile as a USB storage
SyncMate allows syncing any mounted device with your Mac. You can even connect any mobile (even if not supported by SyncMate) in a USB drive mode and sync it!
Sync folders in real time
If you have a folder with numerous files and need to keep it synced with a mounted device, just sync it with SyncMate instead of transferring each file manually. Moreover, SyncMate can sync folders in real time!
Back up mounted device data on Mac
Backup plugin gives you the ability to back up data from your mounted storage on Mac and easily restore it using time marks.

All features for mounted disks