I don't use virtual libraries. I have a couple of saved searches (Kobo - books that are on my Kobos and TBR - books I want to read in the near fufure; the latter is a small subset of the former, which in its turn is a small subset of my whole library) and that's it. For most other things, I use tags or custom columns. I use temporary tags pretty often for some task or another (those get deleted after the task is done).
I'm not big on organizing my library by every tiny detail, mostly because I just have far too many books. I clean up the metadata, assign a genre and some custom tags/columns, edit the css and that's it. Next, the book either gets sent to my Kobos or relegated to the rest of my library.
I don't keep records of my paper books in my calibre library, or any documents/manuals; I keep the latter in my Dropbox documents folder. I also don't read library/subscription books.
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