The concern with Cloud right now is if you start using one vendor and they go away or you fall out with them, what happens to your data then? Can you get it out? Or could it get lost forever? Also, the data is still on a computer somewhere. Is it being backed up properly? How do you know until it goes wrong (ezboard, distribute IT?). And there's that poor bloke for whom Flikr 'lost' 10 years of his photos. Who is mining/spying on your data too? (google, dropbox).
Too many questions for me.
Jim