- It transmits all your data without any encryption
- It only performs integral file updates (i.e., it does not allow for partial file updates, like rsync)
- It is excruciatingly slow, regardless of where you are and what kind of access you have at your disposal
…all of which makes it completely useless for any sort of serious off-site backup. And it does not take kindly to storing encrypted disk images, since even the
.sparsebundle format falls afoul of its limitations.
Known Good Alternatives
What I think someone should do
Or a decent Mac OS X GUI and preference pane for rdiff-backup, which is pretty stable, or duplicity, which has the added benefit of storing the backups in encrypted form (making it possible for me to use just about any machine I want to).
Reclaiming space (from here):
hdiutil unmount ~/Library/FileSync/*/*.sparsebundle hdiutil compact ~/Library/FileSync/*/*.sparsebundle