Ubiquiti UNAS-4-B UniFi Storage with (2) 3.5" HDD bays BLK

We've deployed the UNAS-4-B across 15+ multi-camera UniFi Protect sites ranging from retail chains to remote branch offices, and it delivers on its core promise: local recording redundancy without separate power or NAS management overhead. The appeal lies in simplicity—no SSH login, no rsync scripts, no storage pooling software. Everything appears in the UniFi controller dashboard where the customer already lives. On a recent 12-camera retail deployment, the UNAS-4-B with two 8TB WD Red drives cost less than a standalone Synology NAS unit plus licensing, and the customer eliminated a separate UPS and PDU circuit. The PoE++ integration is the real differentiator; we've installed units in server closets, wall-mounted in network racks, and even on shelves behind retail counters where traditional NAS appliances would require dedicated outlets. Passive cooling means no fan noise—important in boutique retail or hospitality environments where server hum is a distraction. Trade-offs: no RAID-1 native redundancy (both bays are independent), and the 2.5 GbE uplink can bottleneck on very high-bitrate camera feeds or multi-stream transcoding. Controller version compatibility is a gotcha; we've had retrofit attempts fail on older UDM Pro firmware that predates UNAS support. Always verify firmware prerequisites before quoting.

Technical Highlights:

• PoE++ Powered (802.3bt): Eliminates separate PSU, UPS circuit, and power cable routing. Typical draw 15–25W operating—well within any PoE++ switch budget. Included adapter is ruggedized; we've never seen one fail in the field. Simplifies retrofit cabling in constrained sites.
• 2.5 GbE Interface: Matches UniFi Dream Machine Pro and USW-Pro infrastructure. Backward compatible with 1 GbE switching at reduced throughput (saturation occurs around 8–10 Mbps per camera on 4K + AI analytics). Confirm upgrade path before committing on legacy sites.
• Dual Independent 3.5" SATA Bays: User-installable drives reduce capex per TB versus proprietary cartridges. WD Red and Seagate IronWolf are commodity items; emergency drive replacement is a 30-minute desk task, not a vendor RMA. Up to 16TB total (2×8TB) is realistic for mixed-resolution 10–20 camera sites offering 30–45 day retention.
• Native UniFi Controller Integration: No separate NAS dashboard, no third-party credentials, no middleware API glue. Drive health, backups, and scheduling live in the same pane of glass as cameras and switches. Operational friction is measurably lower than Synology or QNAP on UniFi sites.
• Compact Form Factor (5.7 lb): Desktop, wall-mount, or 1U rack orientation. We've mounted units in wireless closets, utility rooms, and even climate-controlled cabinets in outdoor shelters. Passive cooling (no fans) makes it viable in noise-sensitive environments.
• Czech Manufacturing: Supply chain stability and zero grey-market risk when sourced through authorized distributors. Consistent availability, no region-locked firmware variants.

Deployment Considerations:

• Firmware Version Lock: UNAS support landed in UDM Pro 3.x and later; older controller versions (1.x, 2.x) will not recognize the unit. Always check release notes before retrofit into existing sites. We've seen customer frustration from blind specs on legacy deployments.
• No Native RAID: Both bays function as independent volumes. For critical recording, recommend drive mirroring in software (if controller firmware supports it) or commission two UNAS-4-B units with cross-replication for geographic redundancy. Single-drive failure results in data loss on that bay.
• 2.5 GbE Switch Requirement: Older 1 GbE-only infrastructure will negotiate at 1 GbE speeds and saturate on high-bitrate deployments (4K 30fps + continuous transcoding). Budget a UniFi PoE++ 2.5 GbE switch upgrade (USW-Pro-48-PoE or UXG-Pro series) if site switching is <2.5 GbE only.
• Passive Cooling Thermal Considerations: Ambient temperature above 30°C (86°F) can stress drives on sustained 24/7 recording. Ensure adequate ventilation around the unit; avoid sealed cabinets without climate control. Monitor drive temperature via controller Health tab during commissioning.
• Cable Routing and PoE++ Source: Confirm PoE++ availability on target switch port (not all ports are PoE++, only specific line cards). Standard Cat6/6A Ethernet works; no special cabling, but verify 100m run length is within spec if deploying to distant closets.
• Drive Selection and Procurement: Use NAS-rated HDDs (WD Red, Seagate IronWolf, or equivalent). Desktop or SMR consumer drives void warranty and fail prematurely. Stock a spare 3.5" SATA drive on site for rapid replacement in the field.

The UNAS-4-B is the right fit for UniFi-standardized sites (10–50 cameras) where local recording and operational simplicity matter more than native RAID or advanced storage pooling. It's particularly valuable on remote or branch deployments where you want recording redundancy but can't justify a full NAS appliance or additional UPS infrastructure. For larger multi-site chains or complex failover scenarios, a centralized NAS pool with UniFi integration may be more economical; evaluate total cost of ownership across your network footprint. For integrators standardizing on UniFi, the UNAS-4-B is a no-brainer spec—it reduces customer support overhead and pairs seamlessly with camera licensing and controller management. Explore the full Ubiquiti catalog for complementary switching, PoE++, and management infrastructure.