The right NAS for the job.

No — this is the most important thing to understand about NAS. RAID (except RAID 0) protects against a single drive dying, keeping the array online while you replace the disk. It does nothing against accidental deletion, ransomware, corruption, theft, fire, or a power surge — all of which hit the live array and every mirror at once. RAID is for uptime; a backup is a separate copy you can restore from. Follow the 3-2-1 rule: 3 copies, 2 media types, 1 off-site.

A 2-bay NAS in RAID 1 (mirror) gives you one drive's worth of usable space with single-drive redundancy — plenty for photos, documents, and backups for most homes. Choose a 4-bay if you want more total capacity, two-drive redundancy (RAID 6 / SHR-2), or room to expand by adding drives later. Remember RAID redundancy is not extra capacity you get for free — a 2-bay mirror 'costs' half its raw space to redundancy.

It matters more than most specs. A 1GbE port tops out around 110–118MB/s, but a single modern hard drive already reads at ~180–280MB/s — so on gigabit you're throttling the drive by half, and an array or NVMe cache even more. 2.5GbE roughly matches one fast HDD (~280MB/s) and makes large transfers dramatically quicker. For home NAS it's the most worthwhile speed upgrade; 10GbE only pays off with NVMe pools or big arrays.

With its 2025 models (DS225+, DS425+, DS925+) Synology introduced a verified-drive policy that at launch restricted drives not on its list. DSM 7.3 relaxed it: per Synology's policy FAQ, hard drives and 2.5-inch SATA SSDs that are not on the list can now be used for new storage pools on the 2025 DiskStation Plus models, but M.2 NVMe SSDs must be on the list to create a pool or cache, and Synology only guarantees full functionality with listed drives. QNAP, TerraMaster, Asustor, UGREEN and DIY boxes have no such list. Check the exact model's current policy first.

No, it's a nice-to-have, not a requirement. ECC corrects single-bit memory errors and is reassuring on always-on systems with lots of RAM and irreplaceable data. But the 'ZFS needs ECC or it destroys your data' claim is a myth — ZFS is safer with ECC yet doesn't require it, and non-ECC boxes protect data for millions of users. A tested backup protects your data far more than ECC does. Treat ECC (as on Synology's DS925+) as a bonus, not a must-have.

Every NAS ships empty — the drives are a separate, important purchase. Use NAS-rated CMR (conventional) drives like WD Red Plus or Seagate IronWolf. Avoid SMR (shingled) drives in a RAID array: SMR rewrites whole zones on write, which can make a RAID rebuild crawl or fail — dangerous, since a second drive can die during the rebuild. The plain WD Red (non-Plus) and many cheap desktop/shucked drives are SMR, so confirm CMR on the spec sheet.

Buy turnkey (Synology, QNAP, etc.) if you want an appliance: polished software, mobile apps, easy setup, low power, and vendor support, accepting weaker hardware-per-dollar and some lock-in. Go DIY with TrueNAS on a mini PC or built box if the homelab is the hobby or you need real horsepower: far more CPU/RAM per dollar, ZFS on your terms, and no drive lock-in — at the cost of doing your own setup, updates, and troubleshooting. Several boxes here (TerraMaster, UGREEN) explicitly support running TrueNAS.

Most x86 (Intel/AMD) boxes here can. The Celeron/N-series and low-power AMD chips comfortably run a handful of lightweight Docker containers (Pi-hole, media apps, small databases) with 4–8GB RAM; full virtual machines or many heavy containers want a stronger CPU and 8–16GB+. ARM-based budget NAS units and some entry models can't run VMs or full container platforms. If self-hosting is the goal, pick an x86 NAS with expandable RAM.