As for restoring the apps and data.. unless FileZ can find something then I have no idea. I looked deep down into the gvm.store file a while ago and couldn't figure out anything. I have resorted to making a backup of the gvm.store file itself, so that I can just copy it back from the SD card in case of problems (the problems I used to have was that when launching applications which used mathlib.prc everything would burn and die and disappear. That's at least fixed in the latest beta).