I have a $60 ASRock mobo + Intel Celeron quad core combo. Stuck 16gb of Ram in it and two sata controllers. I think ran was the most expensive and the computer now costs $150 without the drivers. I have x8 4TB drives and a 60GB ssd running true nas. That gives me 24TB space and two redundant drives for failure tolerance. From there I run jails (FreeBSD containers) for NextCloud, MiniDLNA, and transmission.