Pick the services you want to run. Get an honest hardware recommendation — no vendor math.
Totals include 30% headroom. Storage recommendation excludes RAID/redundancy overhead — add your mirror or parity on top. Used business mini-PCs and SFF desktops (8th-gen Intel or newer) are the best value for most of these builds.
A Peira Labs field tool. Guides for building exactly this at peira.dev. Remix freely.