You should build or purchase a small NAS device. This way you can export NFS shares to multiple devices. If you need extra privacy and security on a shared LAN, then many operating systems now support WireGuard. This is probably more portable than NFSv4 + Kerberos.
I personally use Raspberry Pi 4 with NetBSD and Samsung T7 SSD. It is completely silent and uses little power. Linux or FreeBSD could also work on this hardware.
