My NAS is an mATX mobo with an i5, 64G RAM, 8 disk drives, 3 nvme drives, and an ARC GPU for video transcoding.

Disk drives are all mirrored. One nvme runs NixOS which is easy enough to redeploy if the drive dies. One nvme is cache on top of the disk drives. Last nvme I use for temp fast storage like Jellyfin transcoding.

Its more of a combo NAS/server as I run most self hosted apps on it (tor node, monero node, jellyfin, *arr stack, etc).