Delete A Backup From The Server

How to get here in the StoreGrid Web Console?
  In the top menu, select: "Server Admin->Customer Management". From the list of customers displayed in the table, click on the Customer Name. This lists the clients under this Customer. Now, click on a client name. This will open a page which lists the backup schedules backing up to this server (from the selected client). Now click on the "Delete Backup" action icon.

If you want to delete a client's backup data associated with this backup schedule, then you can do that from this page. All the backup data associated with this backup schedule will be deleted permanently from the server. If your server can directly reach the client, then the client will also be notified about this deletion. Whether the client gets notified or not about the deletion, the client will take a new full backup to the server, if the same backup scheduled is scheduled again in the client.

You can see the status of the deletion operation from the Server Side Deleted Backup Reports.