Another nice addition to Ubuntu 11.10 is a backup application included out of the box, with the new default application being Deja Dup. It simply appears as "Backup" in the Unity search but still comes up if you start typing "deja."
Deja Dup lets you back up to a local drive, Ubuntu One, a Windows share, or any number of other locations via ssh, webdav, or ftp. You can also specify a "custom location" which from what I've read so far could be something like Amazon S3.
I'm not sure how this compares to BackInTime (http://backintime.le-web.org/
) which is what I've been using for a very long time in Linux, but I'm going to give it a shot this week and see how it goes.