How can I delete Time Machine backups, moved into trash?
To remove or move the Backups.backupdb folder open Terminal.app.


Enter cd /Volumes/&lt;Name_of_BackupDrive&gt;/.Trashes to change the working directory. &lt;Name_of_BackupDrive&gt; 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/&lt;Name_of_BackupDrive&gt;/


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.




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.