Quote:
Originally Posted by itimpi
Normally if you convert then the output format always overwrites an existing format if it exists. One thing you can do, however, is add your master copy as something like a RAR as that would then not get overwritten.
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Thank you itimpi, you are a prince!
I simply changed the extension to .zip, and I get the behavior I want.
I first tried creating a zip from the epub, but Calibre seemed to "automatically" unzip it and added the Epub.