Before you pick the best NAS for a small business, settle what the box actually has to do, because a small office rarely needs raw speed. It needs shared folders that respect Windows or Active Directory permissions, backups of every laptop, snapshots that ransomware cannot delete, and an offsite copy that runs without anyone remembering it. Hardware that handles all four quietly for five years is the goal, and that narrows the field faster than any benchmark.
We shortlisted six small business NAS units for offices of roughly 5 to 50 people, from a budget 4-bay file server to a short-depth rackmount and a ZFS appliance with no license fees. Every price, spec and drive policy below was checked against the manufacturer’s pages and live Amazon listings in October 2026, and the business features (domain join, immutable snapshots, high availability, backup targets) come from each vendor’s own documentation rather than the marketing pages. That matters this year, because Synology changed its drive rules twice and the result is more nuanced than “the lock is gone”.
Best NAS for small business: quick picks
| Award | Model | Price band | Why it wins |
|---|---|---|---|
| Best overall | Synology DS925+ | about $760 | DSM’s full business stack, ECC RAM, third-party drives allowed again |
| Best for Windows and AD offices | Synology DS1825+ | about $1,480 | 8 bays (18 with expansion), 8 GB ECC, PCIe slot for 10GbE or 25GbE |
| Best budget | QNAP TS-464 | about $640 | AD, quotas and a PCIe slot at the lowest price here, plus a ZFS OS option |
| Most hardware for the money | UGREEN DXP6800 Pro | about $1,100 | Core i5, two 10GbE ports, six bays, 3-year warranty |
| Best rackmount | Synology RS1221+ | about $1,650 | Short-depth 2U, 8 bays, High Availability support, no drive lock |
| Best ZFS with no license fees | TrueNAS Mini X+ | about $2,160 direct | 32 GB ECC, dual 10GBase-T, IPMI, snapshot holds included |
Prices are Amazon US on October 1, 2026, and they are moving during the 2026 memory and drive shortage, so treat each as a band and check the live price before you order. Drives are not included in any of them.
How we picked
We started from what a 5 to 50 person office asks of its file server and worked backwards, which ruled out a lot of popular home NAS boxes. A pick needed a domain join or LDAP integration, snapshot protection, a route to offsite backup, a vendor warranty of at least a year, and an Amazon listing sold and shipped in the US at a sane price. We verified specs on each manufacturer’s spec page, confirmed the exact Amazon listing and stock on the day, and read at least one independent review per model (BizTech, ITdaily, ITPro, NASCompares, ServeTheHome or StorageReview).
We did not have these six units in the lab, so we do not quote throughput numbers of our own for them. Where software behaviour matters, we lean on vendor documentation and on testing we have done: our TrueNAS vs Unraid lab run injected real corruption into a ZFS pool and watched TrueNAS repair it, which is the behaviour the Mini X+ pick relies on. We dropped several candidates: the Asustor Lockerstor Gen3 and the Synology DS1525+ were only sold by third-party resellers, the new Synology neo+ series ships with non-ECC memory and was only listed through Amazon Japan, and two-bay models fall below what an office needs.
Small business NAS comparison table
| Model | Bays | CPU | RAM (max) | Network / 10GbE path | Immutable snapshots | Warranty |
|---|---|---|---|---|---|---|
| Synology DS925+ | 4 (9 with DX525) | Ryzen V1500B 4C/8T | 4 GB ECC (32 GB) | 2x 2.5GbE, no slot | Yes | 3 years (5 with EW+) |
| Synology DS1825+ | 8 (18 with 2x DX525) | Ryzen V1500B 4C/8T | 8 GB ECC (32 GB) | 2x 2.5GbE, PCIe slot | Yes | 3 years (5 with EW+) |
| QNAP TS-464 | 4 + 2 M.2 | Celeron N5095 4C/4T | 8 GB non-ECC (16 GB) | 2x 2.5GbE, PCIe slot | On QuTS hero | 3 years |
| UGREEN DXP6800 Pro | 6 + 2 M.2 | Core i5-1235U 10C/12T | 8 GB, no ECC (64 GB) | 2x 10GbE, PCIe slot | No (locked snapshots stay admin-deletable) | 3 years |
| Synology RS1221+ | 8 (12 with RX418) | Ryzen V1500B 4C/8T | 4 GB ECC (32 GB) | 4x 1GbE, PCIe slot | Yes | 3 years (5 with EW+) |
| TrueNAS Mini X+ | 5 + 2 SSD | Atom C3758 8C | 32 GB ECC (64 GB) | 2x 10GBase-T + IPMI | Snapshot holds (full admin can release) | 1 year (3 optional) |
Synology DS925+: best overall for most offices
For an office of up to about 20 people that wants a file server it can forget about, the DS925+ is where we would start, mostly because of the software around it rather than the box itself:
DSM joins an Active Directory domain or Microsoft Entra Domain Services from Control Panel, applies domain users and groups to shared-folder permissions, and supports Windows ACLs over SMB. Btrfs shared folders can take immutable snapshots, which Synology says “cannot be removed by any means” until a protection period you set expires (it recommends 7 to 14 days). That is the single most useful anti-ransomware control a small office can turn on. Hyper Backup then sends an encrypted, block-level incremental copy to another Synology, an rsync server, Azure, an S3-compatible bucket or Synology’s own C2 cloud. The spec page rates it for 40 concurrent SMB connections and 512 local users.
It fits offices of 5 to 20 people that want domain-aware file shares, laptop backup and ransomware-resistant snapshots on one box. Look elsewhere if you need 10GbE, because there is no PCIe slot and therefore no upgrade path, or if your workload needs more than the 4 GB it ships with (plan an upgrade for Synology Drive, Active Backup or VMs, and note Synology limits warranty support on non-Synology RAM). NVMe storage pools still require Synology SSDs. It is about $760 on Amazon, sold by Amazon itself; check the live price.
Synology DS1825+: best for Windows and Active Directory shops
Once an office grows past 20 people, or its data clearly will not fit in four bays within a couple of years, we would step up to the DS1825+ rather than buying a second small box. It runs the same DSM business stack as the DS925+ on eight bays, with 8 GB of ECC memory and a PCIe slot:
The slot is a Gen3 x8 connector with a x4 link, enough for a 10GbE or 25GbE card, and two DX525 expansion units take it to 18 drives. BizTech ran one as the primary file and backup server for a 10-person office for a month, and called out that Active Backup for Business does not charge per seat, which is a real cost advantage over per-device backup software. Synology rates it for 60 concurrent SMB connections and 1,024 local users, and it is on Synology’s list of models that support WriteOnce (WORM) shared folders as well as immutable snapshots.
We would buy it for a Windows office of 20 to 50 users with a domain controller, or for anyone who wants room to grow without a migration later. It is the wrong box if you want to run VMs or heavier apps on the NAS, because the 2018-era V1500B has no integrated graphics and modest headroom, or if you would rely on the expansion units for performance (NASCompares found the DX525 link runs at USB 3.2 Gen 1 speed, 5 Gbps). It is about $1,480 on Amazon, sold by Amazon itself; check the live price.
QNAP TS-464: best budget small business NAS
The TS-464 is the cheapest box here that still checks the business boxes, and it is the only budget pick with a PCIe slot. At about $640 it undercuts the DS925+ by over $100:
QNAP’s QTS handles Active Directory membership, Windows ACLs, and user, group and folder quotas, and it snapshots volumes on a schedule as often as every five minutes. The PCIe Gen3 x2 slot takes a 5GbE or 10GbE card later. The bigger option is the operating system: the TS-464 can run QuTS hero, QNAP’s ZFS-based OS, which adds WORM shared folders and immutable snapshots. You have to choose at install time, because switching from QTS to QuTS hero later erases the drives and QNAP requires removing them first, and inline deduplication on QuTS hero wants at least 16 GB.
For an office of 5 to 15 people on a tight budget that still wants domain integration and a 10GbE path, it’s the obvious pick. Pass on it if you need ECC memory or more than 16 GB, which is this model’s ceiling, or fast NVMe storage (its M.2 slots run at Gen3 x1). It had 257 reviews and sells for about $640, now through a third-party seller (STC Distributors) rather than Amazon, and it currently ships on a later date; check the live price and ship date.
UGREEN DXP6800 Pro: most hardware for the money
On paper, nothing else here comes close for the price: a 10-core Core i5-1235U, two 10GbE ports, six bays, two Thunderbolt 4 ports, a PCIe x4 slot and a 3-year warranty for about $1,100. It’s the box we’d pick for a creative studio that moves large files over 10GbE all day:
The catch is the software, and for a business it is a serious one. UGOS Pro has an Active Directory option in its UI, but an independent test of UGOS found it behaves as an LDAP bind rather than a true domain-member join, so test it against your own domain controller before rolling it out (that test used FreeIPA, not Windows Server). UGREEN’s own backup guide says its locked snapshots “remain manageable by an administrator, so they are not immutable recovery copies”, which means a compromised admin account can delete them. UGREEN also advertises “ODECC”, which is DDR5’s on-die error correction, not ECC memory.
The right buyer is a small studio or team that cares most about 10GbE throughput, or an IT-comfortable office that plans to install TrueNAS on it (UGREEN has said, according to NASCompares, that a third-party OS does not void the hardware warranty as long as it does not damage the hardware). Avoid it if you depend on domain membership, need immutable snapshots for compliance, or want vendor support for the whole stack. We compared it in depth against its closest rival in ZimaCube 2 vs UGREEN DXP6800; it’s about $1,100 on Amazon, check the live price.
Synology RS1221+: best rackmount NAS for a server closet
If the office already has a rack, the RS1221+ is the one we would put in it, and its age is part of the reason. It is a short-depth 2U chassis with eight bays, expandable to 12 with an RX418 unit, running the same V1500B and DSM as the desktop Plus models:
Because it launched before 2025, Synology’s newer drive rules do not apply to it, so third-party hard drives work for new pools. Its 2026 successor, the RS1226+, and the 4-bay RS826+ both state “Compatible drives are mandatory” on their spec pages. It supports Synology High Availability, which pairs two identical units for automatic failover, and Synology rates it for 180 concurrent SMB connections. Pairing has strict conditions, though: identical models running the same DSM version with the same number of LAN ports, identical drives in identical slots, and no SHR or M.2 SSD pools on the active server.
It belongs in an office with a rack, a closet away from desks, and a plan to add 10GbE through the PCIe slot. Keep it out of the room if people sit nearby (ITPro measured the redundant-PSU RS1221RP+ at 58.7 dB at one metre), or if you will not buy a 10GbE card from Synology’s compatibility list (ITPro’s unit refused to boot with a Broadcom card and only worked with an Intel one). Out of the box it is 4x 1GbE. It’s about $1,650 on Amazon, and the dual-PSU RS1221RP+ is about $2,150; check the live price. On a smaller budget, QNAP’s 1U TS-464eU costs about $850 but has no PCIe slot and no 10GbE path.
TrueNAS Mini X+: best ZFS appliance with no license fees
For data where silent corruption is unacceptable (accounting archives, legal files, design masters), we’d choose ZFS on ECC memory, and the Mini X+ is the turnkey way to get it from the company that makes TrueNAS:
It ships with 32 GB of ECC memory (64 GB maximum), five hot-swap 3.5-inch bays and two 2.5-inch SSD bays, dual 10GBase-T and a dedicated IPMI port for remote management. The software is TrueNAS Community Edition, whose feature list includes Active Directory, LDAP, SMB multichannel, SMB auditing, “unlimited and immutable snapshots”, replication and cloud sync, with no per-user or per-feature license. Those snapshots cannot be edited, but a full administrator can still delete them, so TrueNAS recommends running daily work under its Sharing Admin role, which can place a snapshot hold but cannot release one. When we corrupted a gigabyte of one disk in a RAIDZ1 pool on a TrueNAS VM in our lab, TrueNAS served every file intact and a scrub repaired 108 MB in 48 seconds. If AD is the plan, our guide to joining TrueNAS to Active Directory covers the setup.
Choose it when data integrity comes first and someone on the team is comfortable with ZFS concepts. Think twice if you need vendor-grade support, because the default warranty is one year (three is optional), or modern CPU performance, since the Atom C3758 dates to 2017. High Availability is only in TrueNAS Enterprise, not on the Mini. The Amazon listing TrueNAS runs is currently unavailable, so buy it direct: the diskless Mini X+ with the one year warranty is about $2,160 in the TrueNAS configurator, where you can also add the three year warranty or order it with drives fitted. The alternative is TrueNAS on hardware you choose, which our DIY NAS vs prebuilt breakdown prices out.
Synology’s drive policy in 2026: what changed and what did not
This is the question most small business buyers ask first, and the honest answer depends on the model. In 2025, Synology required drives from its own compatibility list on new Plus models. In October 2025, DSM 7.3 relaxed that for 2025 DiskStation Plus models like the DS925+ and DS1825+: third-party hard drives and 2.5-inch SATA SSDs can now create new storage pools. Two restrictions remain, and DSM 7.4 added a third. M.2 NVMe drives still have to be on Synology’s list for storage pools and cache. The 2025 and 2026 RackStation Plus models still require listed hard drives for new pools. DSM 7.4, released in June 2026, added hard-drive deduplication and compression that only works with Synology drives.
Synology’s knowledge base also states the new policies “do not apply retroactively to previously launched systems”, and that clause is the reason the 2021 RS1221+ makes a better rack pick today than its successor. In practice this means a DS925+ or DS1825+ can take the same WD Red Plus or Seagate IronWolf drives you would put in any NAS. Our NAS hard drive picks cover which ones are CMR.
What to look for in a small business NAS
Directory integration that really joins the domain. If your users log in to Windows with domain accounts, the NAS should join that domain so permissions follow people rather than shared passwords. DSM, QTS and TrueNAS all do this; test UGOS before you depend on it.
Snapshots that an admin cannot delete. QNAP warns that ransomware often goes after backups and snapshots first, using stolen admin credentials. Vendors use the word “immutable” for two different things, so check which one you are buying. Synology’s immutable snapshots and QNAP’s on QuTS hero cannot be deleted by anyone, admins included, until the protection period ends. TrueNAS snapshot holds stop day-to-day admins from deleting a snapshot, but a full administrator can release the hold. UGREEN’s locked snapshots stay deletable by any admin. Only the three Synology picks give you admin-proof snapshots out of the box; the TS-464 gets them once you switch it to QuTS hero.
An offsite copy that runs itself. A NAS in the office is not a backup of the office. Schedule a nightly copy to a second NAS at another site or an S3-compatible bucket, and test a restore every quarter. Hyper Backup, QNAP’s HBS 3 and TrueNAS Cloud Sync all handle this.
ECC memory where the data matters. The three Synology picks and the TrueNAS Mini ship with ECC; the QNAP TS-464 and the UGREEN don’t. For ZFS in particular, ECC guards against one of the few failure paths ZFS can’t catch itself: a bit flip in RAM before the checksum is calculated.
A path to 10GbE, even if you do not need it today. Video editing over the network and full-machine backups are the first workloads to outgrow 2.5GbE. A PCIe slot (DS1825+, TS-464, RS1221+) or onboard 10GbE (DXP6800 Pro, Mini X+) keeps the box useful for its whole life, provided the switch can follow; our 10GbE managed switch picks cover that side.
Warranty and support you will actually use. Three years is standard for Synology, QNAP and UGREEN’s 6-bay line, extendable to five on Synology in North America and Europe. TrueNAS Mini is one year unless you pay for three.
Hardening the NAS before the office depends on it
The box matters less than how it is configured on day one, and a few settings decide whether a ransomware incident is a bad afternoon or a lost year. This is the checklist we would run on any of the six before moving the office’s data onto it:
- Create a named admin account with two-factor authentication, then disable or rename the default admin. Day-to-day users never get admin rights.
- Protect every shared folder with snapshots on a 7 to 14 day protection period, hourly or daily. On Synology, turn on immutable snapshots. On QNAP, run QuTS hero and use immutable snapshots or WORM in Compliance mode. On TrueNAS, give daily admins the Sharing Admin role so they can place holds but not remove them. On the UGREEN, replicate to a second box with separate credentials.
- Set the minimum SMB protocol to SMB2 or later, and keep the admin web interface off the internet. Use a VPN or the vendor’s relay service for remote access instead of port forwarding.
- Configure the offsite backup job on day one and restore one folder from it to prove it works.
- Connect a UPS over USB so the NAS shuts down cleanly on a power cut; our UPS picks for a NAS cover sizing.
- Enable email alerts for drive health, failed logins and snapshot or backup failures, and send them to a shared mailbox rather than one person.
Done in that order, the NAS that costs $640 and the one that costs $2,160 can give a small office the thing that matters most: a copy of yesterday’s files that an attacker can’t delete before you need it. On the Synology picks, and on the TS-464 under QuTS hero, that holds even if the attacker has the admin password. On TrueNAS, it depends on keeping the full administrator account out of daily use.
