Actually, I've just unpacked a box and it had exactly 120 books in. They're not terribly big or terribly heavy boxes, but of course all my stuff is paperbacks and much is old - for some reason the newer the book the more pages it has. I suspect the authors get no more though
And one issue with my approach is that it takes me an age to move the airing books to get to my server when it crashes. Guess what?
Iain