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Calibre LIBRARY overhead (if you want to call it that) is:
Overall:
metadata.db and metadata_db_prefs_backup.json
Those are dependent on the number of entries (Books, authors, publishers,Tags and the biggie COMMENTS)
Per Title:
cover.jpeg
metadata.opf
cover size depends on the resolution you maintain (I use the resize cover plugin to shrink the big ones)
Metadata.opf depends mostly on how many Tags you add and the size of the comments (the rest is pretty much the same between books)
Notice the book is not on my list? That is because it is not overhead. It is the same size as without Calibre
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