It can make bootable backups of your Mac OS X system disk.
This keeps the newest files in two locations by copying any newer file from one location over an older version in the other. The two locations can be different disks on the same Mac, a desktop Mac and PowerBook, or a Mac at work and a Mac at home.
Backups can also be made to any file server that appears on the desktop.
The advanced features make it easy to automate and customize operations.