1. Login into Plesk Panel.
2. Click on the "Subscriptions" button on the left side of the screen as marked in the image.
3. Click on the "Websites & Domains" button as marked in the image.
4. Select the "Backup Manager" at the right side of the screen as marked in the image.
5. Select the "Backup File" which you want to remove as marked in the image.
6. Select the "Remove" button as marked in the image.
7. Check "Ok" to remove the backup file.
8. Here you can see Backup File removed successfully.
