For your information, we are in the process of migrating Indefero's main backup server on our new infrastructure. The new infrastructure has been running for a while and we are satisfied with the stability.
We are going to do at the same time a server upgrade, moving away from Ubuntu and back to the roots, that is Debian. Once the backup server will be up and running smoothly, the main server will follow.
Update: Got a bit of instability at the same time... upgrading here and there an old server is difficult. Time to get the migration to a better system completed!