Distributed backups like DIBS have been around for a while. I do offsite backup today over the net because I have servers in multiple locations, though it could be easier than the way I do it.

My goal here is getting as close to ZUI as you can. Not only does this mean it's easy to install, and that you actually use it and don't forget to do things needed for your backup. It also means lots of other people do too, so it's easy to find partners who have good bandwidth to you.