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Backups & Storage · Beginner explainer

What is a NAS, and do I need one in 2026?

A NAS is a small always-on computer that holds all your household's files in one place on your home network, so any phone, laptop, or TV in the house can read or back up to it — and cloud services cannot quietly delete, ransom, or paywall what's on it. Whether you actually need one depends on five questions, not on whether the technology sounds impressive.

The mental model

Think of a NAS as a family filing cabinet kept in a locked closet at home. Anyone in the house has the key, the cabinet is always there, and the contents are yours forever — but the cabinet doesn't protect against fire, the closet can run out of space, and "I bought a bigger drawer" doesn't mean the cabinet has a backup.

  • **Cloud storage** (iCloud, Google One, Dropbox) is a rented storage unit across town — convenient, always offsite, but the rent never stops and the company sets the rules.
  • **An external USB drive** is a single locked drawer — cheap, simple, but only one person can hold it at a time, and if you drop it the drawer is gone.
  • **A NAS** is the filing cabinet. Three load-bearing facts beginners get wrong: a NAS is *yours* (not rented), it is *shared* (not single-user), and **it is not a backup of itself** — the cabinet can still burn down.

Words you will see

NAS (Network Attached Storage)
A small box with 1-8 hard drives inside that plugs into your router. Every device in the house can save to it or read from it over Wi-Fi or Ethernet, like a shared hard drive that lives on your network instead of inside one computer.
Bay
A slot inside the NAS that holds one hard drive. A "2-bay NAS" holds two drives; a "4-bay NAS" holds four. More bays means more total storage and room to add drives later without replacing the whole box.
RAID
A way of using two or more drives together so that if one drive dies, your files survive on the others. RAID protects against drive failure. It does NOT protect against fire, theft, accidental deletion, or ransomware — those need an actual backup, somewhere else.
SHR (Synology Hybrid RAID)
Synology's version of RAID. The advantage: it works with mixed drive sizes (an 8 TB and a 14 TB drive together) and wastes less space than traditional RAID. SHR-1 survives one drive dying; SHR-2 survives two.
Cloud (iCloud, Google One, Dropbox)
A rented storage account on a company's servers. Easy to set up, always offsite, syncs automatically — but the rent never stops, the company can change pricing or rules, and the company can lock you out or have an outage.
External drive
One hard drive in a box that plugs into one computer via USB. Cheap ($20-30/TB in 2026), simple, but offline by default — and a single point of failure.
Snapshot
A frozen-in-time copy of all your files that the NAS keeps automatically. If a file gets deleted, overwritten, or ransomed on Tuesday, you can roll back to Monday's snapshot in two clicks. Different from a backup because the snapshot still lives on the same NAS.

What a NAS actually is, in 30 seconds

A NAS is a small dedicated computer (think shoebox-sized) with 1-8 hard drives inside. It runs a stripped-down operating system whose only job is "serve files over the network." You plug it into your router with an Ethernet cable, give it a name, and from then on every device in the house — phones, laptops, TVs, smart cameras — can save files to it or read files from it as if it were a folder on the device.

Unlike a USB drive, it doesn't have to be physically connected to anything. Unlike cloud storage, the company that made it has no access to your files and can't change the terms next year.

NAS vs cloud vs external USB — when each one wins

Three different tools for three different jobs.

**External USB drive** ($20-30/TB in 2026): cheapest, simplest, one-person, offline. Wins when one person needs a quick backup of one laptop.

**Cloud (iCloud, Google One, Dropbox)**: easiest setup, automatic sync across devices, always offsite, but you rent forever ($120-300/year for 2 TB depending on plan) and the provider sets the rules. Wins when you need data on multiple devices automatically and offsite matters more than ownership.

**NAS** ($400-900 plus drives in 2026): one-time hardware cost, shared by everyone in the house, your hardware your rules, big capacity, but on the same power grid as the rest of your home. Wins when you have over ~500 GB of household media, multiple users, or want a local Plex/Jellyfin/camera-storage server.

**The right answer is usually two of these, not one** — most homes want NAS + a tiny cloud tier for irreplaceable photos.

The 2026 vendor landscape (and what changed in 2025)

The big four were Synology, QNAP, TrueNAS, Unraid. In 2024-2025 that shifted.

**Synology** is still the most beginner-friendly OS (DSM 7.3), but their reputation took a real hit in 2025 when they tried to lock 2025-model NAS units to Synology-branded drives only. Sales reportedly dropped sharply, and in **October 2025 they reversed the policy in DSM 7.3** — third-party WD/Seagate drives now work normally again. Fine to buy in 2026, but trust takes longer to rebuild than a settings reversal.

**QNAP** (QTS 5.2) offers more hardware for the money but a steeper learning curve and worse security history. **TrueNAS Scale 25.10 "Goldeye"** (25.10.2, Feb 2026) is the free open-source option, built on ZFS — most powerful but the most operator-grade. **Unraid 7.3.1** (May 2026) is the cult favorite for media servers because it lets you mix drive sizes freely.

**UGREEN** entered the market in 2024 — by 2026 a credible budget alternative (DXP4800 Plus 4-bay ~$700 vs Synology's $850-1,100 for similar hardware). **Asustor** stayed solid in the Lockerstor/Drivestor lineup. **Ubiquiti UNAS Pro** (late 2024): 7-bay, dual 10GbE, $499 — hardware bargain, software still thin.

The 2026 hardware reality (HDD shortage + Seagate scandal)

Two facts you can't ignore in 2026.

**The HDD shortage is real.** WD confirmed in March 2026 they were "pretty much sold out for calendar 2026." Prices on 16-22 TB drives are up roughly 46% since September 2025. Lead times stretch past 10 weeks. AI hyperscaler demand consumes most production; consumer channel is leftover. Deeper coverage in the HDD shortage guide.

**The Seagate recertified-drive scandal (Jan 2025) still matters.** Some Seagate IronWolf and Exos drives were sold as "new" with SMART hours zeroed but with 15,000-50,000 actual usage hours visible in Seagate's deeper FARM log. By 2026, recertified-drive sellers like ServerPartDeals and GoHardDrive are community-trusted — but every Seagate drive needs a quick FARM check on arrival.

Current $/TB sweet spot: **16-20 TB drives at $24-30/TB**. Larger drives exist but rebuild risk grows faster than the savings.

The 5-question "do I actually need one?" test

1. Does any household member have a photo library over ~500 GB, or expect to in 2 years? iPhone Pro shooters generate 6-10 MB per photo and ~7 GB per minute of ProRes 4K. → Lean yes.

2. Do you have more than one person whose files need to live somewhere they can both reach? → Lean yes.

3. Do you want to run a local media server (Plex, Jellyfin) or store smart-home camera recordings locally? → Strong yes.

4. Are you currently paying $10-20/month for cloud storage you don't actually love? A $400 NAS with $200 of drives breaks even on Google One 2 TB in 30-40 months. → Lean yes.

5. Do you have a real plan for the *backup of the NAS* (cloud, second NAS, rotated external)? If no, start there first — a single NAS is one fire away from total data loss.

If you said no to all five — single user, under 500 GB total, mostly streams Netflix and Spotify, no local cameras — **you don't need a NAS in 2026**. A 4 TB external USB drive for $80 and a single cloud tier covers you.

Common misconceptions

Many people think: A NAS is a backup.

Actually: A NAS is a place to keep files. It only becomes a backup if those files also exist somewhere else (cloud, second NAS, or rotated external drive). A NAS that holds the only copy of your photos is a single point of failure with a fancy enclosure.

Many people think: RAID means my data is safe.

Actually: RAID protects against one or two drive failures inside the NAS. It does not protect against fire, flood, theft, lightning, accidental deletion, ransomware, or a controller failure that takes all drives at once. The standard backup rule is 3-2-1. A NAS with RAID counts as one of those copies, not all three.

Many people think: More drives = safer.

Actually: More drives means more capacity, and (with RAID) some protection against a drive dying. But every extra drive is another thing that can fail, another idle watt, and another rebuild risk. The math actually favors two parity drives once you're past four data drives.

Many people think: A more expensive NAS is a better NAS.

Actually: Above the $400-600 entry tier, you are mostly paying for transcoding power (for Plex/Jellyfin), faster networking (2.5GbE or 10GbE), and extra bays. None of that helps you store photos. A $250 2-bay with two 8 TB drives covers most households indefinitely.

Many people think: Once I get a NAS, I can cancel iCloud / Google One.

Actually: A home NAS is one location. If it dies, gets stolen, or the house burns, everything on it goes with it. The healthiest setup for most homes is **NAS + a small cloud tier (or rotating external)** for the irreplaceable subset.

Ready to actually fix it?

If you decide yes, start here. The decision-and-setup path is well-trodden:

Last reviewed

2026-05-27