This doesn't really help me because I know I am not going to spend all that time digitally scanning my books or listing them on a web site (especially a secondary site which could disappear without notice). I do agree with most of the reasons for cataloguing your books. I get annoyed with myself each time I realize I have two (three even in a couple of cases) copies of the same book. Also, I did have a water tank burst and ruin a lot of books I had kept in the basement. Luckily the water left enough behind for me to estimate a value for the insurance. (But it doesn't really replace the books and I spent the money on something else rather than looking to replace the damaged/ ruined books I had to throw out). For me the smartest thing would really be eliminating a lot of the books I am keeping (hoarding) on my shelves. I don't keep non-fiction books once I have read them. That small decision, several years ago, helped me lose a lot of clutter.
Having your library accessible in an app or doc means never forgetting what you already own and never purchasing unwanted duplicates. If you ever lose the library due to fire, flood, or other disaster you can use the list to rebuild your collection and (depending on your insurance) possibly recuperate some of the money lost. Share the list with your family/friends and they’ll never buy you a book you already own. Track where/when you bought the book, and help preserve memories associated with the purchase. STATS. Do you own more books by men or women; more sci-fi or historical; short story collections or novels; Americans or Brits? Inventory your entire library and find out.Source: 8 Reasons to Catalog Your Books (and How to Do It)