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Re:Petabytes on a budget: How to build cheap cloud storage by blhack on Tuesday September 01, 2009 @04:47PM (#798895)
I'm not entirely sure if this is a troll or not, but...

rsync does exactly what you're looking for. You can also pipe it over SSH encyption on the wire. type "man rsync" at a shell for a description of how.

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