Filterin out the metadata.opf files partially negates the purpose of creating a backup, in return for miniscule space saving.
Don't do it.
Aside -- wow Google, nice job. How many institutes of public education have you pissed off now? My school used them for a while, but the IT volunteer walked off so they switched to Barracuda. Yippee -- now there is an actual honest-to-goodness MITM. And Chrome/Google is not blocking that, naturally.
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