[Geoff Bacon]

I've just hit the same problem on a tablet someone brought me!
Basically, he had cracked the screen and wanted his MSP files transferred to a new tablet.

Using Companion, I performed a backup of the damaged tablet to my PC.
Companion said it was complete - the tablet stuck saying "Backing Up - Packaging"

It then displayed a "MobileSheets isn't responding "Close app/ wait/Send feedback" dialog.
Pressing wait  redisplays the packaging message
Pressing home does display the home screen
Pressing "Send feedback" displays a Google legal dialog (but couldn't press accept or decline) - I thought this was sending to you rather than to Google)
Tablet redisplayed "MobileSheets isn't responding "Close app/ wait/Send feedback" dialog.
Close app did allow access to the tablet

While experimenting, I did get it to the stage that I had to reboot to clear the condition but not quite sure what caused that!

I still have the damaged tablet if you would like to investigate further.

Geoff

MSP 3.5.3  (screen has been damaged for some time so not a recent version of MSP)
Companion 3.1.5