Apple - How can I delete Time Machine backups, moved into trash?

To remove or move the Backups.backupdb folder open Terminal.app.

• Enter cd /Volumes/<Name_of_BackupDrive>/.Trashes to change the working directory. <Name_of_BackupDrive> has to be the volume name of your TM backup volume.

• Enter sudo ls -laO to show all folders. Usually you should see only one folder with the name 501 now:

  d-wx-wx-wt@ 3 root      wheel  hidden 102 Jun 25 20:52 .
  drwxrwxr-x  9 root      admin  -      374 Jun 26 01:21 ..
  drwx------@ 2 user      staff  hidden  68 Jun 26 01:21 501
  

• Enter sudo su to get super user rights.

• Enter cd 501 (Replace 501 with whatever the name of the directory is) to change the working directory and list the content of the folder 501 with ls -laO. Now you should see the folder Backups.backupdb:

  drwx------@ 3 user      staff  hidden 102 Jun 26 01:21 .
  d-wx-wx-wt@ 3 root      wheel  hidden 102 Jun 25 20:52 ..
  drwxr-xr-x  2 user      admin  -       68 Jun 26 01:19 Backups.backupdb
  

• Now you may either move the folder back to the root of the backup drive with:

  mv Backups.backupdb /Volumes/<Name_of_BackupDrive>/
  

  or remove the folder with

  rm -dR Backups.backupdb
  

  If you are asked to override something (e.g. override rw-r--r-- root/wheel uchg for Backups.backupdb/.RecoverySets/0/com.apple.recovery.boot/boot.efi?) enter yes and hit the return button. You may also add the -f option to skip confirmations.

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To delete a 30 GB backup in a virtual machine it took about 3 minutes. So depending on the size of Backups.backupdb some patience is needed.