rsnapshot: rsync-Based Filesystem Snapshot
Aug 26, 2008, 20:01 (0 Talkback[s])
(Other stories by Juliet Kemp)
"That "full backup space" is of course still the gotcha —
basically, you'll need a spare disk. However, external disks are
increasingly cheap; and rsnapshot can be used remotely with ssh. So
you could use one large central disk to keep snapshots of your most
important data from multiple clients."