A NAS (network attached storage) is a small box of hard drives that plugs into your router so every phone, laptop, and TV in your home can reach the same files. If you pay monthly for cloud storage, shuttle files around on external drives, or keep hearing about Plex servers and personal clouds, this guide is for you. I will explain what a NAS actually does in plain language, be honest about who does not need one, and then walk through the four best diskless units on the market, with live Amazon prices checked July 6, 2026.
What Is a NAS, Really
A NAS is a personal cloud that you own instead of rent. Think of Google Drive or Dropbox as renting shelf space in someone else's warehouse: convenient, but you pay every month forever, and the landlord sets the rules. A NAS is buying the shelf and putting it in your closet. Same idea, files reachable from anywhere, except the hardware sits on your network, the monthly bill disappears, and nobody else's terms of service apply to your photo library.
Physically, it is a small, quiet, always-on computer with slots (called bays) for hard drives. The four units in this guide weigh between 1.16 kg and 3.79 kg and draw as little as 6 W when the drives are asleep, so running one costs less per month than a single streaming subscription.
How It Works
You plug the NAS into your router with an Ethernet cable, slide in one or more drives, and run a short setup wizard from a browser. After that it shows up like any other folder on your computers, and the manufacturer's phone apps back up your camera roll automatically, the same way iCloud or Google Photos do.
Two terms are worth knowing. RAID is a way of spreading data across two or more drives so that if one drive dies, your files survive on the other. And 2.5GbE is a faster flavor of the standard Ethernet port; all four picks here have it, which in practice means large files copy at roughly the speed of a decent external SSD instead of crawling.
Who Actually Needs One
Most casual users do not need a NAS, and I want to say that before showing you hardware. If you own one laptop, your important files fit in 100 GB, and a $2 per month cloud plan or a pocket SSD already covers you, a NAS adds cost and complexity for no real gain. Buy the external drive and move on.
A NAS starts making sense when one of these is true:
- You pay $10 or more per month for 2 TB of cloud storage. That is $120 a year forever, versus a one-time hardware purchase.
- Your household has multiple people and devices that need the same photo library or document folders.
- You want a Plex or Jellyfin media server that streams your own movie files to every TV in the house.
- You work with big files (video, RAW photos, backups of several machines) and are tired of drive juggling.
- You like to tinker: Docker containers, home automation, hosting small services.
If two or more of those hit, the rest of this guide is your shopping list.
What to Look For
First-time buyers can shop confidently with six checkpoints:
- Bays: 2 bays cover backups and a media library; 4 bays are for people who already know they will hoard data, since you can add drives over time.
- Diskless means diskless: every unit here ships with zero storage. NAS-rated hard drives run very roughly $50 to $100 or more per drive depending on capacity, so the real total is the sticker price plus two to four drives.
- Network port: 2.5GbE is the sensible floor in 2026. 10GbE only matters if you edit video over the network.
- RAM, and whether it is upgradeable: more RAM means more apps running smoothly at once. Soldered RAM is the classic budget trap.
- CPU type: an Intel x86 chip can hardware-transcode video for Plex; the cheapest ARM boxes cannot.
- Software: the operating system is where brands really differ. Synology's DSM is the most mature; younger platforms trade polish for hardware value.
The Best NAS You Can Buy Right Now
All four picks below are diskless, brand-established, and current models; prices are live Amazon prices as of July 6, 2026.
| Model | Award | Price (diskless) | Bays | Network | RAM | Warranty |
|---|---|---|---|---|---|---|
| Synology DS225+ | Best Overall | $338 | 2 | 2.5GbE + 1GbE | 2 GB (max 6 GB) | 3 years |
| Asustor AS1202T | Best Budget | $199.99 | 2 | 2.5GbE | 1 GB (fixed) | 3 years |
| TerraMaster F4-425 | Best 4-Bay Value | $365.49 | 4 | 2.5GbE | 4 GB (max 16 GB) | 2 years |
| UGREEN DXP4800 Plus | Power Pick | $656.99 | 4 + 2 M.2 | 10GbE + 2.5GbE | 8 GB DDR5 (max 64 GB) | 2 years |
| Attribute | Synology DiskStation DS225+ 2-Bay NAS (Diskless) | Asustor Drivestor 2 Gen 2 AS1202T 2-Bay NAS (Diskless) | TerraMaster F4-425 4-Bay NAS (Diskless) | UGREEN NASync DXP4800 Plus 4-Bay NAS (Diskless) |
|---|---|---|---|---|
| Rating | 4.6 | 4.6 | 4.1 | 4.5 |
| Price | $339.99 | $199.99 | $365.49 | $656.99 |
| CPU | Intel Celeron J4125, 4 cores, 2.0 GHz (2.7 GHz burst) | Realtek RTD1619B, 4x Cortex-A55 at 1.7 GHz | Intel N5095, 4 cores, 2.0 GHz (2.9 GHz burst), x86 64-bit | Intel Pentium Gold 8505, 5 cores (1P+4E), up to 4.4 GHz |
| RAM | 2 GB DDR4, expandable to 6 GB | 1 GB DDR4 (soldered, not expandable) + 8 GB eMMC for ADM OS | 4 GB DDR4 SODIMM, expandable to 16 GB (1 slot) | 8 GB DDR5, expandable to 64 GB |
| Network | 1x 2.5GbE + 1x 1GbE RJ-45 | 1x 2.5GbE RJ-45 | 1x 2.5GbE RJ-45 | 1x 10GbE + 1x 2.5GbE, up to 1,250 MB/s |
| Drive bays | 2x 3.5"/2.5" SATA (diskless, drives sold separately) | 2x 3.5"/2.5" SATA, up to 60 TB raw (diskless) | 4x SATA (3.5"/2.5"), hot-swap, up to 120 TB raw (diskless) | 4x SATA (3.5"/2.5") + 2x M.2 NVMe, up to 144 TB total (diskless) |
| USB | 2x USB 3.2 Gen 1 | 3x USB 3.2 Gen 1 (5 Gbps) | 2x USB 3.2 10 Gbps + 1x 5 Gbps | — |
| Rated transfer speed | 282 MB/s sequential read | — | — | — |
| Noise | 19.6 dB(A) | — | 21.0 dB(A) standby (120 mm fan) | 29-34 dB quiet mode (140 mm fan) |
| Power draw | 16.98 W access / 6.08 W HDD hibernation | 11.2 W operation / 6.95 W disk hibernation (65 W adapter) | 33.0 W loaded / 13.0 W hibernation (90 W supply) | — |
| Dimensions | 165 x 108 x 232.2 mm | 165 x 102 x 218 mm | 222 x 179 x 154 mm | — |
| Weight | 1.3 kg (diskless) | 1.16 kg (diskless) | 2.1 kg (diskless) | 3.79 kg (diskless) |
| Warranty | 3 years | 3 years | 2 years | 2 years |
| Video out | — | — | 1x HDMI, 4K60 H.264/H.265 hardware transcoding | — |
| System SSD | — | — | — | Built-in 128 GB SSD for UGOS Pro |
| Ports | — | — | — | USB-C 10 Gbps, USB-A, SD card slot, 4K 60Hz HDMI |
| Buy | View on Amazon | View on Amazon | View on Amazon | View on Amazon |
Best Overall: Synology DiskStation DS225+
If this is your first NAS and you value your time, buy the Synology DS225+. At $338 it is Amazon's number two best seller in the category with a 4.6-star average across 169 ratings, and the praise clusters around one thing: DSM, the software, makes setup, backups, and Plex genuinely easy. The 2.5GbE port pushes up to 282 MB/s, it runs at a near-silent 19.6 dB(A), and it sips 6.08 W with drives hibernating, all backed by a 3-year warranty.
The most common buyer complaint is the drive-compatibility lock at launch: multiple Amazon reviews report that only Synology-branded drives worked until the DSM 7.3 update restored Seagate, WD, and Toshiba support. That is fixed for anyone buying today, though it is a fair warning about how Synology operates. The 2 GB of RAM (6 GB ceiling) will only bother heavy app tinkerers, who should look at the UGREEN instead.
Best Budget: Asustor Drivestor 2 Gen 2 AS1202T
The Asustor AS1202T is the cheapest sensible entry into NAS ownership at $199.99, undercutting the Synology by almost $140 while keeping 2.5GbE and Btrfs snapshots. Drive installation is tool-free, it draws just 11.2 W in operation, and TechPowerUp measured it beating rivals with stronger hardware in everyday file work. For phone backups, a shared family folder, and light streaming, it is all the NAS most people need.
The most common complaint is the 1 GB of soldered, non-expandable RAM: owners of this Drivestor line report memory sitting above 50 percent utilization and apps turning sluggish when several services run at once. If you plan to run backups plus Plex plus a download client simultaneously, that ceiling will find you; if the box just quietly backs things up, you will never notice. Also note the bays are not hot-swappable and the listing is new, with only 23 ratings so far.
Best 4-Bay Value: TerraMaster F4-425
The TerraMaster F4-425 is for the buyer who already knows they will hoard media, at about $91 per bay. For $365.49 you get four hot-swap bays scaling to 120 TB raw, an Intel N5095 x86 chip that hardware-transcodes 4K60 for Plex (buyers confirm it runs without hiccups), and a standard SODIMM slot that takes RAM from 4 GB to 16 GB. No other recognized brand gives you that expansion room at this price.
The trade-off shows in its 4.1-star average, the lowest here, and the most common complaint is TOS software quirks: one-star reviews report 15 to 20 minute boot times, user logins not being retained, and lost remote access on designated ports. That will genuinely frustrate anyone who wants appliance-grade reliability out of the box; it matters less to a patient buyer who prioritizes capacity per dollar and does not mind the occasional forum search. Mixed build-quality feedback (including rubber feet that come unstuck, now with two spares in the box) fits the same pattern.
Power Pick: UGREEN NASync DXP4800 Plus
The UGREEN DXP4800 Plus is the buy-once option: hardware that rivals charge four figures for, at $656.99. It is the only pick with 10GbE (rated up to 1,250 MB/s), and the 12th-gen Pentium Gold 8505, 8 GB of DDR5 expandable to 64 GB, dual M.2 NVMe slots, and a built-in 128 GB system SSD leave nothing as a bottleneck for years. It is also the most-reviewed unit here at 4.5 stars across 629 ratings, with buyers consistently reporting a full setup inside 30 minutes.
The most common complaint is not really UGREEN's fault: buyers are surprised at how much usable space RAID redundancy eats out of the pool, a recurring theme in Amazon's review summary. That stings newcomers who bought four drives expecting the full raw total; it will not bother anyone who read the callout above. More fairly attributable: some buyers report the cloud remote-access side is unreliable, and UGOS Pro's app ecosystem is younger than Synology's, which is why tinkerers often end up on TrueNAS or Docker. Fill all four bays and the real total passes $1,000.
Bottom Line
A NAS is worth it the moment more than one person, or more than one machine, depends on your files. For most first-time buyers the Synology DS225+ at $338 is the right call: the software carries it. If $338 plus drives stretches the budget, the Asustor AS1202T at $199.99 delivers the core private-cloud experience for less, as long as you keep the app count modest. Media hoarders who want four bays without flagship money should take the TerraMaster F4-425 and accept the software rough edges, and anyone who edits video or refuses to buy twice should spend up for the UGREEN DXP4800 Plus. Whichever you pick, remember the drives: the sticker price is the down payment, not the total.
