A NAS — network-attached storage — is your own private cloud: a small, always-on box of drives that lives on your home network, quietly backing up every device in the house, streaming films to the television, and holding the years of phone photos that would otherwise fill someone else's servers. The difference from a cloud subscription is control. With a cloud service your files sit on another company's machines, and the operator can analyse how you use them, typically for advertising. With a NAS the data stays in your house, and only you have access to it. That is the whole appeal of the phrase "private cloud".
An extensive test of beginner-friendly units — each fitted with two NAS-rated drives and set up as a mirrored pair — produced five recommendations. All five are available in Britain.
The short version
What to Look For
Bays, and the mirror. A "bay" is a slot for a drive. Two-bay units are the sweet spot for a first NAS: run two drives as a mirror and your data survives one drive failing. A mirror halves usable space, so two 4 TB drives give 4 TB of protected storage, not 8 TB. Four-bay models hold far more and allow more flexible protection.
They come empty. Almost all of these are sold diskless — you buy NAS-rated drives separately, and fitting 2.5-inch drives usually needs an optional caddy. This is exactly why calling them "NAS drives" misleads: what you are buying is the enclosure and its software.
Software is what you are really choosing. Synology's DSM is the benchmark, with well-documented tools for file access, fully automatic client backups, backups from the NAS out to external storage, and folder syncing over remote connections. The Btrfs file system with folder snapshots adds a genuine safety net. A friendly app ecosystem matters more to a beginner than raw specifications — though the test notes the flip side, that Synology's sheer breadth of functionality can overwhelm a newcomer.
Network speed. The port sets how fast files move. Plain gigabit is fine for backups and streaming, but 2.5 GbE pushes past 220 MB/s, and the fastest units here run 5 GbE or 10 GbE. If you routinely move large video files, pay for the faster port.
Memory and processor. More memory means smoother multitasking and better media handling, and a stronger processor matters if you want virtual machines or containers. The most capable unit here takes up to 64 GB.
Power and heat. A NAS runs constantly, so efficiency counts — and a four-bay machine loaded with spinning drives is markedly thirstier than a compact two-bay one. Give any unit room to breathe, and prefer quiet cooling if it will live in a room you sit in.
Best Overall: Synology DS223j
The DS223j is the pick for most first-time buyers, and it is the first of Synology's entry-level "j" series to offer the Btrfs file system with folder snapshots — the feature that makes accidental deletion and ransomware survivable rather than catastrophic. Around it sits the software that makes Synology what it is: tools and apps for reaching your files, fully automatic backups from your computers to the NAS and from the NAS out to external storage, and folder syncing over remote connections. The test praised its enormous, excellently documented feature set, its exemplary security strategy and its photo management, which uses AI-based face recognition.
It is frugal too: in testing, power draw in sleep mode fell to an extremely economical 3.1 watts.
Two honest caveats. That breadth of functionality can overwhelm someone setting up their first NAS, and 2.5-inch drives or SSDs fit only with an optional caddy. Check the price on Amazon
Best for Fast Transfers on a Budget: Asustor Drivestor 2 Pro Gen2 AS3302T v2
If you want transfer rates beyond 220 MB/s without spending heavily, this is the one to look at. It is a two-bay front-loader built on a Realtek quad-core processor with 2 GB of memory and three USB3 ports, and it takes drives without a screwdriver behind a magnetic cover. Measured maximum rates on its 2.5 GbE port ran 220 to 230 MB/s reading and writing — more than twice what a plain gigabit NAS manages — though writing into an encrypted shared folder drops it below 90 MB/s. Power draw sits between 16 and 20 watts idling and writing, falling to 5.6 watts once the drives sleep, and App Central offers roughly 150 apps. Asustor now includes photo management with face recognition, though at the time of testing it was a beta and not yet a match for the winner's. The warranty runs to three years, and swapping a failed drive in a mirrored pair proved child's play: pulling a live drive paused a streaming video for about five seconds before it carried on, and the array rebuilt itself once the drive went back in.
One setup trap is worth knowing: to be able to use the straightforward volume snapshots, you must avoid the fully automatic one-click setup, which does not format with Btrfs. The test also notes that RAID-1 here gives you only a static volume, and that storage quotas are not available with Btrfs. Check the price on Amazon
Best Two-Bay Step Up: Synology DS225+
Synology's first two-bay model with a 2.5 GbE port, and it keeps a second, ordinary gigabit port alongside it. Over the fast connection it achieves more than double the transfer rates of the DS224+ it succeeds. Beyond the usual high-quality expansion apps it adds business applications such as Active Backup for Business and Synology's own Virtual Machine Manager — for which you should expand the memory to 6 GB. Its AI photo management sorts images by theme as well as by face — it took about 22 minutes to build thumbnails for 1,100 photos — and this model raises Synology's warranty from two years to three. Left alone for a set period it drops into sleep, taking idle draw from just under 18 watts down to an extremely economical 4.3 watts.
The reservation is a real one: Synology reserves full support for machines fitted with its own drives rather than another manufacturer's, and uploading HEIC photos is somewhat awkward. Check the price on Amazon
Most Powerful: Ugreen NASync DXP4800 Plus
In an aluminium case, this is the performance choice: its 10 GbE port achieved between 950 and 1,050 MB/s on a suitably fast network, and four SATA bays plus two NVMe slots let you combine very large capacity with maximum transfer rates. It ships with 8 GB of memory in a roughly 4 kg aluminium case, and its photo tool built thumbnails in under 7 minutes while handling face recognition briskly. Despite the power on offer, setup is exemplary and genuinely beginner-friendly, and the smartphone app is a highlight — Ugreen manages to fit every function into one app and keep it legible. The standout extras are an excellent virtual-machine host, Docker management and AI-assisted photo management, with memory expandable to 64 GB for running several virtualisations at once.
It is the most compromised of the five on the software side, though. Shared-folder encryption is not supported, snapshot handling is clumsy, PC backups are incomplete, and the app selection remains thin. There is no mail notification, no VPN server and no SNMP. With four hard drives fitted its power draw is high. Check the price on Amazon
Silent and Solid-State: Terramaster F4 SSD
The F4 SSD is the outlier of the group: at just 0.6 kilograms it takes only NVMe SSDs, up to four of them. A 5 GbE port gives it a very quick network connection at roughly 400 to 500 MB/s, while power draw stays moderate — under 14 watts idling with four NVMe SSDs fitted, rising to about 25 watts when writing, and just 9.2 watts idling with only two installed — and the cooling built into the base is all but silent. Good setup guides and videos make installation pleasingly simple, and the software setup very nearly runs itself. It has comprehensive backup functions and quick AI photo management — thumbnails plus face and scene recognition took the little machine under 10 minutes — and it is light enough to move somewhere else without ceremony.
Weigh the cost of filling it, though: NVMe storage is still expensive, and that sits on top of an already higher price for the enclosure. Note too that SMB1 is enabled from the factory, and the HDMI output does nothing. Check the price on Amazon
How the Testing Works
Every NAS — normally sold as an empty enclosure — has two 3.5-inch drives fitted and configured as a RAID-1 mirror, using NAS-specific Seagate IronWolf drives (16 TB apiece in the units fitted with hard disks); where a machine uses NVMe SSDs and faster multi-gigabit networking, IronWolf NVMe SSDs are used instead. Transfer performance is measured on both gigabit and multi-gigabit networks, alongside power draw when writing, idling and sleeping, and the energy-saving features including sleep mode and scheduled power on and off. How easily remote access can be set up, and whether it works in any home network at all, counts as well.
Failure is tested deliberately: what happens when one of the two mirrored drives fails, how easy it is to replace, and whether the unit restarts reliably after a power cut during sleep. Backup and sync functions, app expandability and specialities such as photo management with person recognition and automatic phone photo backup are all exercised. Finally, the units are scanned with the Nessus vulnerability scanner and the Nmap security scanner for known, serious, still-unpatched security holes.
Frequently asked questions
Which NAS is best for beginners? The Synology DS223j. It provides tools and apps for getting at your files, fully automatic backups from your devices to the NAS and from the NAS to external storage, and syncing of selected folders over remote connections — and the Btrfs file system with folder snapshots raises the safety of your data further. Other models in the test convinced too, which is what the rest of this guide is for.
Who actually needs one? Anyone handling large files such as videos and backups, or large quantities of data such as a photo collection, who wants to reach them from several devices around the house.
Why bother, when cloud storage is partly free? Control. With a cloud service your photos and files sit on someone else's servers, and the operator can analyse usage data for its own purposes, typically personalised advertising. If you would rather keep your data local and under your own control, a NAS suits you better. If that does not matter to you and you would rather not manage storage at all, a cloud subscription is often the more comfortable route.
What do I have to do about security? Everything — you are entirely responsible for the safety of what you store. Mirror your data inside the NAS with RAID-1, and take regular external backups to attached USB storage or another network drive. Every device with write access to a shared folder should run good, constantly updated virus and malware protection. And keep the NAS operating system current with the manufacturer's latest firmware updates.
