Praise and gratitude for this fabulous tool.
It would be very nice to have an option to simply overwrite the existing epub file, rather than create a backup with the ".ORIGINAL_EPUB" extension. Since I'm running the routine immediately after importing the book to Calibre, I already have a backup in the original imported file. If the results should go disastrously wrong (though they never do), I can always re-import the original. Would save the extra step of having to delete the backup copies every single time.
Even though I already made a $ contribution some time ago, I would seriously consider doing it again if my wish were granted.
Thanks!