Did what you have suggested. Quited osmo Removed ~/.osmo Restarted osmo Added several test data Backup Data Restore Data Everything lost, backup is still a 50 bytes file!
Other thing i have noted by the way: Config -> General -> Media(sound)player can't be changed, sticks with "play %s". There is no play on the system. After creating a bash script "play" which calls mplayer, it did'nt get called (no sound played) even while it is reachable/findable via PATH. Strange enough i have managed to change this to "mplayer %s" once, after adding some data. Now it still sticks with "play %s", while the other options i have changed so far didn't get rejected. Note: I always get an request for a password whenever i try "Backup Data", even when there is no password protected note. The backup i have successfully restored from an old osmo version does have a protected note btw.