It is already there ... as long as the provider allows it. _that_ is the death trap. You can download a file (and locally backup it), not a stream.

Well, yes, technically, we as tech savvy people could, but the commoners (not to say technophobics), they don't know how.

and that is how it is designed. You don't need backup, it's in the cloud. What happens when it is not anymore ?

It is not owning but rather preserving that is the concern. Is everything worth preserving though, I don't know.