n00bs on Ubuntu posted a guide about installing Deja Dup on Ubuntu 11.04

Déjà Dup is a simple backup tool. It hides the complexity of backing up the Right Way (encrypted, off-site, and regular) and uses duplicity as the backend. Déjà Dup does not use cron or similar schedulers. Rather, it starts a program deja-dup-monitor when you log into your session. This keeps track of when you last successfully backed up and will wait until the next scheduled backup. It determines exactly when the next scheduled backup is largely on its own, based on the user’s preferences about whether to backup once a day, once a week, etc.

  Install Deja Dup On Ubuntu 11.04