Even before E2E - to my knowledge, whatsapp would only store messages until they could be delivered. They never really stored your chats once they made it to th

Even before E2E - to my knowledge, whatsapp would only store messages until they could be delivered. They never really stored your chats once they made it to their destination - there shouldn't be any "restoring" of backups that brings back messages unless it's just a re-delivery at most. (And honestly, i'd doubt that gets backed up).