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Originally Posted by steve1977
Thanks again for your help.
I am trying to improve my workflow in Calibre.
* I have epub2 files that I like to convert to epub3 and also to embed metadata. Do I first use convert from toolbar and then the poilish books plugin (update metadata in the book files)
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Polish works on any existing. Convert uses the current LIBRARY metadata.
So no need to run polish on a fresh conversion.
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* Do I need the opf file if I embed the metadata? If not necessarily, how can I stop Calibre from creating it?
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That is the backup (along with the cover image) of what shows in the GUI and is there to recover from corruption.

It is a
tint tiny file, whats the big worry. multi-TB HD's are cheap
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* Do I need to keep the "original_epub" file? Do I need to keep multiple formats per ebook? Can I set up Calibre to delete pdf or epub2 after converting?
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NO as long as you don't ever want to go back. Preferences: Tweaks: # Save original file when converting/polishing from same format to same format
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Thanks again for the helpful on this forum. Really great!
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