Quote:
Originally Posted by FrozenInferno
I disabled Calibre from automatically backing up the original file in the Tweaks section of the Preferences.
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It's smarter to reenable it and just delete the ORIGINAL_EPUB when your conversion is better than the original. By disabling that option, you overwrite your EPUB every time. If you make a mistake in the conversion, you will wipe out the original with your bad converted copy.