When a website is permanently deleted from Enhance, the backups are not immediately removed from the backup server. However the snapshots will continue to expire as per your backup retention settings under settings->backup so eventually all backups will be removed. Until this happens, you can restore the backups manually by re-creating the website and copying the website files to the home dir and restoring the databases with MySQL CLI or through the Enhance panel.
This behaviour has saved a lot of customers from disaster, for example where their billing system marked the renewal date incorrectly and terminated a paying customer.
We're working on a UI to manage deleted site backups which gives you the opportunity to restore them in a more automated manner or delete them permanently if you're sure you don't need them.
