Quote:
Originally Posted by GRiker
If you want to experiment with tweaking an ePub, use calibre's Save to disk to save a backup copy of your original ePub before you begin.
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You may also prefer to duplicate the record inside Calibre and work on that record. Use Add Book to add an empty book record, select that record first, then select the book you want duplicated and press ALT-M to do a safe merge (merge-keep others) of the second book into the empty record. The order of selection is important. Note that merging does not duplicate ISBN, and the date field is updated to the date the new empty record was added, so it's not an exact copy of the first record. When you're done, you can delete the EPUB you don't like (from either the new record or the old one) and merge the two records to end up with a single record and your preferred EPUB.
Great feature GRiker!