Updated November 2026
Data from the official Ubiquiti site.
2026 verdict
One of these NAS is built for a shelf and the other for a rack, and the Ubiquiti UNAS Pro 4 wins overall for anyone who has a cabinet.
It wins on memory (8GB against 4GB) and on storage, adding four hot-swappable bays with RAID 5 and RAID 6 plus two M.2 slots, and it carries two 10G SFP+ cages and a Gigabit port in a 1U chassis. The Ubiquiti UNAS 2 is the more affordable of the pair and the quieter, smaller choice, a two-bay desktop with mirroring, snapshots and single-cable PoE that does everything a basic UniFi file share needs.
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| Feature | Ubiquiti UNAS 2 | Ubiquiti UNAS Pro 4 | Winner |
|---|---|---|---|
| Price | $275.99 | $596.91 | Ubiquiti UNAS 2 |
| Memory Capacity | 4 GB | 8 GB | Ubiquiti UNAS Pro 4 |
| Storage | None | Hot Swappable | Ubiquiti UNAS Pro 4 |
What the differences mean
Form factor
The Ubiquiti UNAS 2 is a desktop box that sits quietly on a shelf; the Ubiquiti UNAS Pro 4 is a 1U rackmount. A home without a cabinet is better served by the desktop, while a business with a rack gets tidy mounting from the Pro 4.
Bays and hot swap
The UNAS 2 has two non-hot-swappable bays in a shared tray, so replacing a drive means powering down. The UNAS Pro 4 has four hot-swappable bays, so a failed drive can be swapped with the array still running.
Memory
The UNAS Pro 4 ships with 8GB of memory against 4GB on the UNAS 2. Neither is user-expandable, and the larger pool matters once several shares, snapshots and UniFi Protect footage run at once.
Redundancy
The UNAS 2 offers mirroring only. The UNAS Pro 4 supports RAID 5 and RAID 6, so it survives one or two drive failures while keeping most of the raw capacity usable.
Networking
The UNAS 2 has a single 2.5 GbE port that also carries PoE power. The UNAS Pro 4 has two 10G SFP+ cages plus a Gigabit port, which is far faster but needs SFP+ modules and a switch with matching cages.
Which one to buy if
- you want a quiet desktop share in a UniFi home
The UNAS 2 is a small, low-power desktop with mirroring and a single-cable PoE install.
- you run a small business with a rack and 10G uplinks
The UNAS Pro 4 fits 1U and carries two 10G SFP+ cages plus a Gigabit port.
- you want parity so one failed drive does not cost you the array
The UNAS Pro 4 supports RAID 5 and RAID 6 across its four bays.
- you want the lowest-power single-cable install
The UNAS 2 draws up to 60W over PoE, well under the UNAS Pro 4's 150W.
$275.99
- + Price: $275.99
- - Memory Capacity: 4 GB vs 8 GB
- - Storage: None vs Hot Swappable
Winner
10% OFF
$596.91
$663.00
- + Memory Capacity: 8 GB
- + Storage: Hot Swappable
- - Price: $596.91 vs $275.99
Frequently Asked Questions
Which is better overall: Ubiquiti UNAS 2 or Ubiquiti UNAS Pro 4?
The Ubiquiti UNAS Pro 4 for a rack install, with 8GB of memory, four hot-swap bays, RAID 5 and RAID 6 and two 10G SFP+ cages. The Ubiquiti UNAS 2 is the quieter, more affordable pick for a simple mirrored desktop share.
What is the biggest difference between the Ubiquiti UNAS 2 and the Ubiquiti UNAS Pro 4?
Their shape and roles. The Ubiquiti UNAS 2 is a two-bay desktop with mirroring and a PoE port, while the Ubiquiti UNAS Pro 4 is a 1U rackmount with four hot-swap bays, RAID 5 and 6, more memory and 10G SFP+ uplinks.
Do the Ubiquiti UNAS 2 and UNAS Pro 4 run the same software?
Yes, both run UniFi Drive and are managed inside the UniFi console with snapshots and remote backup. Neither runs Docker containers, virtual machines or a third-party app store.
Which one survives a drive failure without downtime?
The Ubiquiti UNAS Pro 4, with four hot-swappable bays and RAID 5 and RAID 6. The Ubiquiti UNAS 2 has two non-hot-swappable bays and must be powered down to replace a drive.
Who should buy the Ubiquiti UNAS 2?
A home or small office inside UniFi that wants a compact, low-power desktop share with mirroring and one PoE cable.
Who should buy the Ubiquiti UNAS Pro 4?
A business running UniFi that needs rack-mounted storage with fast SFP+ uplinks, hot-swap bays, parity RAID and more memory.
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