As someone else mentioned, for a NAS using TrueNAS (used to be FreeNAS) is easy enough and quite satisfying. You can find plenty of guides. In general, you ne

As someone else mentioned, for a NAS using TrueNAS (used to be FreeNAS) is easy enough and quite satisfying. You can find plenty of guides. In general, you need to balance budget, capacity requirements, and form factor. Old servers are often great. Big disks seem like a good idea, but for rebuild times going over 4TB is horrible. However, unfortunately HDD prices right now are horrible...