What's the cheapest next step up for a home server / NAS solution from a raspberry pi with an external drive plugged in? I switched to this from when I previously used an old desktop for it because space restrictions kept me from actually having a wired connection on that, but I am limited by the speed of USB 3 and can't do raid or easily add more drives or anything like that. Plus drive enclosures seem unreasonably expensive to the point where a used small form factor pc almost makes more sense.