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Time Machine is stuck in PREPARING BACKUP and this is on the log. 2019-06-07 14:55:52.889748+0100 localhost backupd[1299]: (Foundation) [com.apple.foundation.filecoordination:claims] Read (Subarbitration) options: 1 -- URL: <private> -- purposeID: com.apple.TimeMachine.snapshot -- claimID: C38F...