I was surprised that there are very few PC cases made for small NAS. So this solution of buying a consumer product and installing FreeNAS on it makes sense.
These things are great for small NAS. https://buy.hpe.com/us/en/servers/proliant-microserver/proli...
I should probably update the software, but I already broke it once trying that, so for now it's sitting happy as a dumping ground for files.