Quote:
Originally Posted by eschwartz
A tag was edited most likely, depending on where this (and other actions) was done, this will cause all books sharing that metadata to be backed up. Nothing *changed* except for the timestamp usually, and apparently a new piece of info calibre decided to store by default in the OPF, which was not previously present and thus had to be added.
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Changing/deleting any tag used in a book:
The (backup) OPF does get rewritten because Tags are stored in clear text.
OPF files are small