One library here (and it's in serious need of tagging) of about 2,500 books.
I grab a lot of freebies, can't seem to help it (it's a sickness), but I don't actually add them to my Calibre library until/unless I'm ready to read them or it's a book I read as paper in the past. All my freebies are backed up, but I haven't felt the need to setup a Calibre library for them (yet).
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