Good observations, Andrew. Our use cases line up pretty well with what you suggest.
At Zetta (http://www.zetta.net) we currently see 20% Backup, 10% DR, 40% Archive and 30% Primary Storage (often file sharing) with DR as our fastest growing segment.
And a sequence of surveys we did shows a growing movement or planned movement to cloud storage (see http://www.zetta.net/_wp/?p=428).
Jeff Bell
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