I have to admit that I don't really understand the advantage of online backups. It is much faster and verifiable to back up to a volume on your network, or an external USB or SATA drive and take it off-site.
It could take hours to days to restore a backup from an online source, whereas the onsite backup will have you up and running in minutes.
I guess the online backup would survive a nuclear accident, tornado or tsunami wiping out your whole town, but restoring your AC backup is unlikely to be all that important in that circumstance.
