First off I didn't make Mer I'm just trying to help you troubleshoot, but the backup should only reinstall Mer installer not Mer. When you process your backup you can tell it what programs to install and what not to install so just leave Mer installer off. I would suggest reporting it as a bug so the developers can see and and see about fixing it. http://wiki.maemo.org/Mer/Sprints at the bottom of page it tells you how to report bugs for Mer.