While I do use virtual libraries, I found backing up my huge collection to sd card is really slow. So, I put books I'm not likely to read again into an Archival library. I move them there without deleting from my Current library. Then in the Current library, I add "Archived" to the tag and delete all the formats. So, their names are in the Current library, but the books are actually in the Archived one. This lets me know if I have the book just by looking at the Current library. Hope this explains my reasoning.
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