Fix to delete time machine backups for no-responding finder

Just compelled to upgrade to OSX High Sierra, because XCode 9.3 is only available for 10.13 to support development over iOS 11.3!  The system seems quite the same except for the new ridiculous Chinese Translation of UI.

As usual, a Time Machine backup was made before the upgrade. But since NAS disk is quite full, some history backups need to be deleted after everything runs OK. Well, the new finder is frozen during the Time Machine deleting process and un-escapable from that UI. After a hard reboot and some googling, the following steps might help:

  1. connect to target Time Machine Sparse Bundle
  2. ensure that /Volumes/Time Machine Backup/Backups.backupdb shows
  3. sudo tmutil delete /Volumes/Time Machine Backup/Backups.backupdb/YOUR-MAC/SOME-DATES
  4. eject Sparse Bundle
  5. sudo hdiutil compact TARGET-SPARSE-BUNDLE

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