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A collection of work/school critical projects/code has a far different set of needs from a computer storing an ungodly amount of porn and music.It is a front end to duplicity that performs incremental backups, where only changes since the prior backup was made are stored.It has options for encrypted and automated backups.It can backup to local folders, Amazon S3, or any server to which Nautilus can connect.Integration with Nautilus is superb, allowing for the restoration of files deleted from a directory and for the restoration of an old version of an individual file.On my home setup I have a small script that backs up a couple of folders I wouldn't like to lose, it does this incrementally.
My work laptop gets everything backed up to a server and never has mission critical stuff left on it anyway.
Déjà Dup is (from Ubuntu 11.10) installed by default.
It is a GNOME tool intended for the casual Desktop user that aims to be a "simple backup tool that hides the complexity of doing backups the Right Way".
Note that as of February 2016 this project appears to be almost completely ignoring bug reports with only minor triage activity and the last bugfix dates back to 2014, though there are new releases with minor changes. You can't restore specific versions of individual files very easily.
However you can restore the entire backed up content to a specific backup.
For instance I can restore to last week, or to the week before, or the week before that, etc It can connect to anything nautilus can see.