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Why You Need a UPS
A UPS (Uninterruptible Power Supply) protects your NAS from power cuts, preventing data corruption and RAID array damage. Sudden power loss during a write operation can corrupt files or trigger a lengthy RAID rebuild. Every NAS should have a UPS.
UPS Sizing
A typical 2-4 bay NAS draws 30-60W. A 650VA UPS provides 15-30 minutes of runtime — enough time for safe automatic shutdown. For 6-8 bay NAS or NAS + switch + router, a 1000-1500VA UPS is recommended. Synology and QNAP support USB-connected UPS for automatic shutdown via NUT protocol.
Top UPS Picks
Best for 2-4 bay NAS: APC Back-UPS 650VA — reliable, compact, USB interface. Best for larger setups: CyberPower CP1500EPFCLCD — 1500VA, sine wave output, LCD display.
| UPS | Capacity | Buy |
|---|---|---|
| APC Back-UPS BX650LI | 650VA / 325W | Check Price |
| CyberPower CP1500EPFCLCD | 1500VA / 900W | Check Price |
Frequently Asked Questions
Does a NAS need a UPS?
Strongly recommended. Power loss during writes can corrupt RAID arrays. A UPS is inexpensive insurance for your data.
Recommended NAS Hard Drives
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How we verify this guide
We cross-reference compatibility figures against manufacturer specifications where available, official service manuals, and the standards that govern fit — memory type and speed (DDR4 / DDR5 / LPDDR5), maximum supported capacity and slot count, SSD form factor and interface (M.2 2280, NVMe PCIe vs SATA, keying), and charger wattage and connector (USB-C Power Delivery, GaN). We’re explicit about soldered or non-upgradeable parts, prioritise primary sources over retailer listings, and re-verify the data on a regular cycle. More on our method →
