It will prompt you upon start up to update all the firmware, RC etc, but you can still fly as normal if you wish.
Well aware of that as well. Literally only use the iPad for Phantom nothing else. So not much to back up since my flights and records are synced. Hence don't have a backup. Thanks for the suggestion thoughIf you had taken up backup of your iPad mini, I'm sure you can get your old app back with little care else your repo will also be updated to newer app.