BTRFS send/receive may fail in between, leaving the partially completed backup. Although, this can be covered by sending subsequent snapshots and they (if succeeded) would be ok, this failed one will still be corrupt and we should remove it as soon as the backup volume is online.
The procedure to mark the snapshots transferred successfully - is to touch the .success file in the snapshot directoty (close to info.xml). If there is a snapshot directory, but no .success file - we should run the send/receive again.
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