Choose the books you want to store on a bookshelf or in storage boxes. You can rotate the books out of storage as you feel the need or as you finish reading the books on the shelves.
Distribute the paperback books so the weight of the books sits evenly on the shelves of the bookcase. Use a bookend to keep books upright or lay a few books horizontally to keep the books from tipping over.
Place books in the storage boxes horizontally so the spines are kept safe from damage. Store the boxes in a dry, temperature-controlled area. Damp places, like a basement, may promote mold or warping of the pages and covers of your books.
Frequently clean and dust the shelves where your books are displayed. Also do a monthly check on the paperback books that you've placed in storage boxes. Doing so will ensure your books stay free from damage for years.