There are services like eazy backup or borgbase that I would consider backups

But iCloud or Google drive or Dropbox or onedrive are not.

Aside from account deletion when you overwrite a file there’s no retention — backups should be immutable, they’re vulnerable to bitlockers, storing media on them can trigger hash based piracy detection systems (whether you’ve legally acquired material or not), and they don’t have a policy that allows you to bulk download quickly without interruption or rate limiting.