Like nostr:nprofile1qqspdq3w68h5s0hkasfkn4ff0cdgxhv6rjf0hneuaevve0say6v4j3cppemhxue69uhkummn9ekx7mp0uxemlx said, an old desktop can be a good and affordable option. I myself bought a 4TB SSD and put it in one my old machines, running for a couple of years and works great.