In the modern era of smart security, seamless integration and centralized management are key factors for effective systems. The Ubiquiti Cloud Key Gen2 Plus positions itself as a cornerstone for the UniFi Protect ecosystem, combining an NVR (Network Video Recorder) and an AWS-like console for network management. But is it the right choice for you? While some users praise its compact build and features, others are skeptical about its storage limitations and cost-efficiency.
In this review, I’ll dissect the Cloud Key Gen2 Plus and explore whether it’s the essential first step for your UniFi Protect system or if better alternatives exist.
Features and Build Quality
The Cloud Key Gen2 Plus boasts a sleek and compact design, measuring 5×5 inches. Its small footprint makes it ideal for rack-mounted setups or tight installation spaces. Key highlights of the hardware include:
- Front Display ScreenThe small display on the front provides a quick glance at the status of connected devices within the UniFi Protect and network management ecosystems. It’s a practical feature that reduces the need to log into a dashboard for basic checks.
- Power RedundancyEquipped with a USB-C port in addition to its main power connector, the Cloud Key Gen2 Plus ensures uninterrupted operation even during power outages. By using a 2.0 or 3.0 Quick Charge USB-C adapter, you can set up a fail-safe power system.
- Drive Bay for 2.5-inch Hard DrivesA key feature of this device is its internal 2.5-inch hard drive slot, designed to house laptop-grade drives. The kit includes a 1TB hard drive, but here lies one of the major drawbacks - there’s a limited selection of surveillance-grade drives in this size category.
- Back Panel ConnectivityThe back of the unit features a USB-C port, power button, and an undocumented port whose purpose even Ubiquiti’s official documentation does not clarify. It’s speculated that this could support external storage or future updates.
- Tool-Free Drive AccessThe hard drive is housed in an easily accessible bay at the bottom. A simple release mechanism allows for quick removal and replacement of drives, which is convenient for maintenance and upgrades.
Power button
Reset button
Optional USB-C power input
PoE port
Port for a later update
2.5’’ HDD bay with a pre-installed 1TB SSD
Critical Analysis of the Drive System
The built-in hard drive system comes with trade-offs. Let’s explore these in detail:
- Default 1TB HDD: While it’s a welcome inclusion, this drive size is not optimized for recording high-resolution 4K footage. Users with multiple cameras will quickly find themselves running out of storage.
- Surveillance-Grade Limitations: Finding a surveillance-grade hard drive in a 2.5-inch format is a challenge. Such drives are specifically designed to handle the constant read/write demands of security systems. Without them, standard HDDs risk overheating and performance degradation over time.
- SSD Upgrade Recommendation: Replacing the default hard drive with an SSD significantly improves performance and reduces heat. SSDs are also less prone to wear, making them a more reliable choice for mission-critical surveillance systems. However, this upgrade adds to the overall cost of the unit.
"For professional-grade security, an SSD is not just an upgrade - it’s a necessity to ensure optimal performance and longevity."
Setup Considerations
The compact size of the Cloud Key Gen2 Plus makes installation straightforward, but there are important factors to keep in mind:
- Power Management: The redundant power feature via USB-C is a standout benefit. It provides peace of mind for installations in areas prone to power fluctuations.
- Thermal Concerns: Due to the tight enclosure and continuous operation, thermal management becomes critical. Using an SSD mitigates overheating risks, but proper ventilation in the installation environment is equally important.

CloudKey+ (UCK-G2-SSD)
Technical Specification
Mechanical & Capacity
| Dimensions | 131.2 x 27.1 x 134.2 mm (5.2 x 1.1 x 5.3″) |
| Weight | 560 g (1.2 lb) |
| Enclosure material | Anodized aluminum |
| HD cameras 2K cameras 4K cameras |
24148 *Assumes the UCK-G2-PLUS is dedicated to UniFi Protect only. If it’s also running UniFi Network, your maximum camera limit will be lower. Hardware
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