I had heard about this before, and I think it is really great - for small amounts. For backing up my laptop hard drive (~250 GB) and everything I normally would keep backed up (another... 1 TB?) or even some fraction thereof, this would get SUPER expensive. :(
What I really need backed up: - Documents (~5GB) - Photos (~20GB)
What I would _like_ backed up includes everything to do a full drive recovery, but beyond that, music [40 GB] and other harder-to-replace things.
If I can't backup all my backups, that's fine, but I think under even the bare-bones situation, rsync would be outside my budget :)