Earlier quoted context omitted.
You can sleep soundly: it seems like they back _everything_ up: > Second, the script we used provided both the "mark for deletion" capability ... (where recoverability is desirable), and the "permanently delete" capability that is required to permanently remove data when required for compliance reasons . The script was executed with the wrong execution mode and the wrong list of IDs. The result was that sites for app…
No, I don't think that's disturbing. That's the point of backups - even when something is permanently and completely erased in the production database, it's still in the backup. Eventually it will get rotated out as the backups expire. Going back and purging things from the backups as part of the delete process would be overdoing it to a ridiculous degree.
Also, modifying backups is a great way to inadvertently hose your backups.