- Unlock all the existing volumes under the OS(disabling the Bitlocker might be a good idea since it might protect even unallocated disk space)
I should disable bitlocker during the backup-timeframe? Or what do you mean?
- You can run disk part clean all within the OS (I bet this could be done via Recovery Media as well) and then perform a bare metal recovery
I tried diskpart within Recovery-Media OS to delete Volume C:. But it didn't help at all. I also tried to overwrite the existing Partition Table with the one from the Backup - no success. I confirmed btw. that Bitlocker was indeed activated during Backup-Time - but I didn't get a Message or Warning, that there was a Bitlocker Partition at all.
I will try again, when another Surface 3 dies.
Thanks for help.