Cloud = Virtualization. Creating redundancy within the same virtual ecosystem is idiotic, as the article points out. Any hardware or virtualization software failure would throw your redundancy out the window. You need to have your virtual eggs in very different baskets, in different geographical locations, with different providers.
Upvotes are literally a +/-1 of agreement. It's a bit of a tough crowd (probably related to the subject matter), but either way, comments are meant to add something to the discussion.