Quote:
Originally Posted by DNSB
azw3 files are very similar to epub files. You can edit them with calibre's ebook-editor or convert them to ePub with KindleUnpack which will give a result much closer to the original source file (ePub is the most popular source format for KDP). KFX is semi-compiled and a conversion from KFX to ePub gives, from the point of view of someone who wants to edit the book, a very ugly starting place.
From the point of view of being able to backup my ebooks, I really don't care about the input format. From the point of view of being able to edit the ebook before sending it to my ereader, I do care.
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For me there's no real difference, as I don't much care about the closeness to the original source and actually prefer customized calibre conversions to original AZW3/KFX.