Backups are accessed by clicking the gear icon 
in the upper right hand corner of the page and clicking on Backups.
Once on the backups page, find the backup you want to delete and move your mouse over the backup to reveal the controls. Then click the delete button.
Once the delete button is clicked, you will be prompted to confirm your deletion. To finish deleting the backup, click the "Delete Backup" button.
Once deleted you will be given a confirmation that the target backup was deleted.
