Comment 3 for bug 1159235

Yeah, there is something different about the GUI notification at the end. It is triggered via DBus, and root just can't use the user's DBus session.

The true fix for this is to add policykit support to gvfs, so that you don't have to run the whole of deja-dup as root, but rather, deja-dup can just ask for the root password when it sees a file it can't read/write. See bug https://bugzilla.gnome.org/show_bug.cgi?id=490200

I could add a temporary message in the GUI when run as root, as you suggest. But truth be told, running as root is not really recommended. It's a mode I don't want to formally add support for.