Playing around with dpgk it seems all the telenor operator specific ackages are named ending with -320

I would assume the same applies to other branded handsets, just with a different number.

Digging further I'm pretty sure I could uninstall mwelcome-logo-320 and operator-bookmarks-320 to get rid of the useless stuff. But I'm not going to try until I have a way to reflash if disaster strikes.

Has anyone tried out the backup and restore process and know what exactly is backed up?