Quote:
Originally Posted by jackie_w
There's are 2 options in Prefs - Tweaks to change the original_ behaviour for anyone who wants to.
save_original_format = True/False controls what happens during conversions
save_original_format_when_polishing = True/False (as the name suggests) during Polishing
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Personally, I want the original file kept. I've had several occasions with malformed epubs where Polish and/or Modify Epub got garbage in and spewed scrambled garbage out. Hence, I now open new epubs in either Sigil or calibre's editor and run the various checkers before any file change operations.