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When you are done with your edits, don't Save but Save As yyyymmdd Title. This will also automatically sort your files sequentially. (I am assuming your document editor does automatic saves, otherwise you would have to do this too often).
There is a good question on this topic here: http://stackoverflow.com/questions/5593775/automatic-file-versioning-like-dropbox Alternatively, if you have a background in programming, use Git. It was designed for storing different versions of application source code, but works well for other types of documents, too.
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