Time Machine is extremely useful for user backups, but server administrators might have different backup requirements.
OS X Server provides several command-line tools for backing up and restoring data:
rsync: Use this command to keep a backup copy of your data in sync with the original. rsync copies only the files that have changed.
ditto: Use this command to perform full backups.
asr: Use this command to back up and restore an entire volume.
For more information about these commands, see their man pages.