I never really paid attention to the metadata.opf files until I started using a weekly automated program to create a mirrored back-up copy of my library.
I have noticed every week now 1000's of books I know I haven't opened, read, edited or changed metadata on were being reported by the software I use as being in need of updating as they had changed.
I used UltraCompare today to take a peek inside several of the files to see exactly what was being changed and it appears it is only
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<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="uuid_id" version="2.0">
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and
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<dc:contributor opf:file-as="calibre" opf:role="bkp">calibre (1.24.0) [http://calibre-ebook.com]<
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As this seems to be somewhat trivial info, I assume it's safe to start excluding opf files other than ones for books I know I have updated? I know the files are minuscule, but in the aggregate it adds up when doing an online backup.
I am also wondering why calibre appears to only update some books in this fashion.