I would pick up a late model i3, put it into a mini-ITX board and case. This is what I did for some NAS servers that I wanted to be compact, support QuickSync

I would pick up a late model i3, put it into a mini-ITX board and case. This is what I did for some NAS servers that I wanted to be compact, support QuickSync transcoding for Plex, and support a SAS PCI card that breaks out to (8) 10Tb HDDs in a ZFS configuration. Not that the Pi is bad or anything but I see people trying to use them as routers and NAS and the performance isn’t fantastic, maybe on par with an intel chip from 10 years ago. You’d be much better grabbing some old PC hardware on eBay and throwing parts together.