Personal Backup X4 – System/Disk Utilities:
Backs up your files automatically or manually, to removable media (such as recordable CDs or DVDs), to partitions on your hard disk, to network volumes, to an iDisk, to an iPod, to external hard drives (USB ou FireWire) or to disk image files. Intego Personal Backup X4 also restores backups, synchronizes data between two computers (such as a desktop computer and an iBook or PowerBook), and clones your Mac OS X volume.
This looks interesting. I suspect a lot (all?) of these solutions are variants on rsync and cpio and I’m just too lazy to provide the glue that will make it all work.