I built my first homelab from secondhand gear, and it taught me more than a new NAS ever could

NAS units are great. They’re small, energy-efficient, and easy to get running right out of the box. If the only thing you want is a backup solution for your files, and you’re not picky about cost, they’re a good option. However, if you want a real homelab, you’re much better off picking up some secondhand components instead—your machine will be more powerful, and you’ll learn more in the process.