Me, personally ...
I find tar suits me just fine, but BackInTime seems to work too.
Prefer Dropbox over Ubuntu One but things may change as UO progresses.
Dropbox IS good, though. Very handy and its restore/undelete feature is a real lifesaver. Its also nice to have my Linux laptops and OS X machines be able access common files and synch with each other.
Wi$$$h I'd invented it.