If you go to the data warehouse administrator’s page, select some backups and click “Delete”, you will see that the page on which you have the page has a form on it with hidden fields. This form submits backup identifiers (as separate fields with the same name "backup_id") to this URL: /_ah/datastore_admin/backup_delete.do
Backup_id are the keys of the _AE_Backup_Information objects in the data warehouse.
I have not tried using it yet. The form uses the XSRF token.
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