Give better information regarding backups created in higher level.
When a customer in Plesk removes a subscription-level backup which is a part of full-server backup (or reseller's backup and some customer's backup in case of special rights), it is not displayed anymore in subscription's backup manager. However, it is not actually removed from the server. This confuses customers because they are not aware of what actually occupies so much disk space.
Feature suggestion: make some note/banner in customer's backup manager to inform them that there are some backups which were created on a higher level.
Prevent backup deletion if created at an higher level.