I know, but it could be the reason why a format reapers in the library after it was deleted. Maybe there's an option to prevent calibre from storing the format after uploading it to the reader. I haven't checked that either. (I just convert every book to AZW3, and keep it alongside the EPUB. If there is a significant change or bugfix in the AZW3 converter, I just remove the AZW3 books and convert again overnight.)
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