One external online provider really only counts as "one copy", ever. This is primarily because you cannot audit the ongoing storage architecture and processes of any given provider. You're looking for SPOFs, not how many disks may hold data replicas. One software error (or site/account hack) can wipe out all of your data. Or an entirely out-of-band error occurs: the provider goes belly-up.

Cloud storage is awesome in many ways. Yet it doesn't replace your backup strategy, it merely complements it.