Home server guides

If you are building a first home server, read them in this order. The buying order first, because it settles the single decision most people get wrong, which is treating the enclosure as the purchase and the drives as an accessory. Then RAID levels explained, which gives you the vocabulary and the capacity formulas. Then how to choose NAS drives, which is where the money goes.

The one sentence worth memorising before any of it: RAID is not a backup. Parity protects against a drive dying. It does nothing about accidental deletion, ransomware, a failed controller writing garbage to every member, theft, fire or flood, because each of those reaches every drive in the chassis at the same instant. An array is your fast working copy and copy one of three. The 3-2-1 backup guide covers the other two.

The second thing worth internalising early is what a rebuild costs. Reconstructing a failed member means reading every sector of every surviving drive, on drives that are the same age and often from the same manufacturing batch, for a day or more. That window is the most dangerous period in an array's life, and it is the entire argument for double parity once drives pass roughly 8 to 10 TB. Migrating to a bigger NAS walks through it, because a drive-by-drive upgrade means doing that rebuild once per drive.

After that the guides split by what you are trying to do. Power consumption and networking basics cover running costs and throughput ceilings. Burn-in testing and security hardening cover the two failure modes that actually lose people data: a drive that was faulty from the day it arrived, and a writable backup reachable from an infected machine.

Everything here is researched guidance, not professional data recovery, electrical or IT advice. Verify figures against your own manufacturer documentation, keep verified backups, and have mains wiring done by a licensed electrician.