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Originally Posted by theducks
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if this issue can confuse
theducks what hope for us mortals
The
save_original_format tweak offers this explanation for why the ORIGINAL_xxxx files are created
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When calibre does a conversion from the same format to the same format, for example, from EPUB to EPUB, the original file is saved, so that in case the conversion is poor, you can tweak the settings and run it again.
By setting this to False you can prevent calibre from saving the original file.
Similarly, by setting save_original_format_when_polishing to False you can prevent calibre from saving the original file when polishing.
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Given that is the
developers rationale for creating the ORIGINAL_xxxx files, surely it follows that once a satisfactory conversion/polish is obtained one ought to remove the ORIGINAL_xxxx format file. My impression is that confusion arises when they're left lying around.
FWIW I have both flags set to False. I prefer to address the issue of securing and recovering 'last known good' ebook format files myself.
BR