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Doesn't seem very useful to me. I can't think of any occassions where I would want to go back to the point of time "before doing any edits" as opposed to the point of time "before xxx action". So I'm not particularly interested in implenting this, you can always generate the ORIGINAL_EPUB yourself, by simply using the "Polish Books" tool before running the editor for the first time. Or you can use the "Save a copy" function in the editor itself.
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