If you have a Time Machine backup, it’s important to delete it if you want to change your mind about keeping it. Deleting a backup will stop the Time Machine from backing up any data that is in it. To delete a Time Machine backup:

  1. Open the Time Machine app on your computer.
  2. Click on the “Backups” tab.
  3. Scroll down and click on the “Delete backups” button.
  4. Type in a reason for deleting the backups and click on the “Delete” button.