If you want build a simple, versatile, reliable, and inexpensive backup device that fits your pocket, the Little Backup Book is right up your alley. Instructions in the book can help you assemble an automatic backup device using a Raspberry Pi (or any other single-board computer) and the Little Backup Box software. The resulting device can handle practically any storage media (cards, regular and solid-state disks, cameras, etc.) and costs only a fraction of what you would pay for a similar product on the market. The book provides an in-depth description of how to build, configure, and extend a Little Backup Box backup device.