Hi. Im using Samsung tab S2.
Profiles were kept in the default directory i think, which is just Magicbox folder in root.
I keep all my games on my sd card and they are all still there. Its just the data for magicdosbox that disappeared.
I noticed samsung installed some crap again without permission a week ago. Even though i turned off their apps ability to do that.
I kept my backup in the root magicbox directory as i just had a backup incase app would get corrupted. Did not think samsung would go about deleting directories without permission so i just kept it there.
Sync to google drive or dropbox sounds like a good idea.
Good luck and thanks for magicbox.