A suggestion - the prime directive in any move is to prevent data loss, so I'd suggest that once a move starts, access is prevented. Since it appeared to my users that they could (and did) use the app once the migration was started, they went ahead and used the app - things seemed normal to them. I didn't know there was a move in progress even other than happening to check the forum after it had already been in progress for a day. But then once the migration was complete, data they entered went missing because it had been entered after the backup was made, I guess (support ticket is opened - not sure if I will see the data in the restore since I think it happened mid migration, after the backup).
I think that's the point about the not enough complete info. If I had known we should close our apps during the migration I would have. Now it has been 4 or 5 days and I'm still not sure what the fix will be if there even is one, whether I should go ahead and try to recreate the missing data or whether to wait for the restore via the open ticket. Just a lot of confusion because of the missing data and not knowing whether and when things might or might not be fixed.