5 Best UPS for a NAS (October 2026)
The best Best UPS battery backups for a NAS include the APC Back-UPS BE600M1 600VA for small NAS setups, the APC Back-UPS Pro BX1500M 1500VA for shared home offices, and the APC Back-UPS BE850G2 850VA for growing home networks.
On this page (10 sections)
- How we chose the best UPS for NAS storage
- Which of these UPS units fits your NAS?
- Check NAS shutdown compatibility before comparing capacity
- Size the UPS around watts, VA and shutdown time
- Decide how long the NAS should stay online
- Put the right network devices on backup outlets
- Set up automatic shutdown while you can supervise it
- Avoid the mistakes that leave a NAS unprotected
- Keep the UPS cool and plan for battery replacement
- Choose the best UPS for your NAS setup
The best UPS for a NAS is the APC BE600M1 for a small home setup with a supported shutdown connection. Choose the BE850G2 for a growing network, or the BX1500M when a desktop PC needs to share backup power.
Your first buying check should be NAS compatibility, followed by the connected load and required shutdown time. A UPS can keep the power on while still failing to tell an unattended NAS when it needs to stop.
The right choice gives your storage time to close files and shut down before its battery runs out. Extra runtime helps with brief outages, but a dependable shutdown plan matters more than keeping the NAS online until the last minute.
Our picks at a glance
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Check itCyberPower EC850LCD 850VA Ecologic
Best for shared computer desks - 5
Check itCyberPower ST625U 625VA Standby UPS
Best for compact network corners
How we chose the best UPS for NAS storage
We compared backup outlets, power capacity, runtime claims, battery maintenance and status controls for a home NAS network. The scores reflect those features and each unit's fit for the buyer described beside it.
The BE600M1 and BX1500M share the top score because they serve different needs: a small network and a shared office. Neither is a universal choice for every NAS, power supply or shutdown method.
The APC runtime figures below use the same 100W load, making them useful comparison points. No matching runtime figure is supplied here for either CyberPower model, so neither receives an invented estimate.
| Product | Best for | Capacity | Battery backup outlets | Total outlets | Our score |
|---|---|---|---|---|---|
| APC Back-UPS BE600M1 600VA | small NAS setups | 600 VA / 330 W | 5 | 7 | 8.5 |
| APC Back-UPS Pro BX1500M 1500VA | shared home offices | 1500 VA / 900 W | 5 | 10 | 8.5 |
| APC Back-UPS BE850G2 850VA | growing home networks | 850 VA / 450 W | 6 | 9 | 8.4 |
| CyberPower EC850LCD 850VA Ecologic | shared computer desks | 850 VA | 6 | 12 | 7.9 |
| CyberPower ST625U 625VA Standby UPS | compact network corners | 625 VA | 4 | 8 | 7.4 |
Which of these UPS units fits your NAS?
Choose around the equipment that must stay powered, rather than the NAS bay count alone. A small NAS with separate networking devices can need more backup outlets than a larger NAS beside a combined modem and router.
The following picks stay in score order, with a clear reason to choose or skip each one. Confirm the exact UPS model against your NAS maker's compatibility guidance before ordering.
APC Back-UPS BE600M1 600VA: Best for small NAS setups
- 600VA and 330W
- Seven outlets, five with battery backup
- APC runtime claim: 23 minutes at 100W
- User-replaceable APCRBC154 battery, sold separately
- 1.5A USB charging port
A compact starting point for a small NAS, router and modem. Choose it when the combined load and shutdown time fit its capacity and your NAS supports the required UPS connection.
Pros
- Five battery outlets cover several core network devices
- User-replaceable battery extends service options
- Phone charging works during an outage
Cons
- Less capacity for a shared desktop setup
- No LCD for checking load or estimated runtime
APC BE600M1: best UPS for a small NAS setup
Choose the BE600M1 when you need a compact backup for essential network gear rather than a whole workstation. Its 600VA/330W capacity and five battery outlets suit a modest NAS, router, modem and other low-load devices within those limits.
APC claims 23 minutes at a 100W load. Use that as a reference for planning a shutdown window, rather than a promise that your own equipment will run for the same time.
This model makes sense when your NAS normally runs unattended and you want it to stop safely during a longer outage. A supported communication connection remains essential, even if you only need a few minutes of backup.
The user-replaceable APCRBC154 battery gives you a maintenance path when the original battery ages. Keep its replacement model in your equipment notes so a future swap doesn't become a search through similar cartridges.
Skip it when a desktop PC will share the battery side or when your load needs more reserve. Its phone charging port is convenient, but that feature shouldn't decide which UPS protects your files.
APC Back-UPS Pro BX1500M 1500VA: Best for shared home offices
- 1500VA and 900W
- Ten outlets, five with battery backup
- LCD shows charge, load and estimated runtime
- Automatic voltage regulation
- User-replaceable APCRBC124 battery, sold separately
The capacity pick for a NAS sharing backup power with a PC and monitor. Its load display and voltage regulation also suit a home office with changing power demand.
Pros
- Highest power capacity in this group
- LCD helps track the connected load
- AVR corrects voltage swings without using battery power
Cons
- About 15 inches deep
- Only five outlets provide battery backup despite the larger capacity
APC BX1500M: choose it for a NAS beside a desktop
The BX1500M is the better choice when one UPS must support storage and a working computer. Its 1500VA/900W capacity leaves more room for a desktop and monitor than the smaller models here.
Its LCD shows charge, load and estimated runtime, helping you see how much demand the full desk creates. APC claims 68 minutes at 100W, though a busy desktop can push the combined load well above that reference point.
Automatic voltage regulation corrects high and low input voltage without drawing on the battery. That feature is useful where brownouts occur alongside full outages.
Plan the outlets carefully despite the larger capacity: only five provide battery power. A NAS, PC, monitor, router and modem would use all five before you add a separate network switch.
Choose it for shared office use or greater runtime reserve at a modest load. Skip it for a shallow shelf, since its body is about 15 inches deep, and settle the shutdown arrangement for both computer and NAS before relying on one shared unit.
APC Back-UPS BE850G2 850VA: Best for growing home networks
- 850VA and 450W
- Nine outlets, six with battery backup
- APC runtime claim: up to 35 minutes at 100W
- User-replaceable RBC17 battery, sold separately
- Silenceable alarm and LED indicators
A useful step up for a NAS network that also needs a modem, router, switch or separate access point. It adds a battery outlet and a longer claimed runtime than the BE600M1 at the same load.
Pros
- Six battery outlets suit a network with separate devices
- Longer claimed runtime than the BE600M1 at 100W
- APC provides a three-year warranty
Cons
- No LCD for load and runtime estimates
- Heavier than the BE600M1 at 9.6 pounds
APC BE850G2: choose it for a growing network
The BE850G2 fits a NAS network that needs more connections and a longer shutdown cushion than the BE600M1 offers. Its 850VA/450W capacity supports six battery outlets, with three additional surge-only outlets.
APC claims up to 35 minutes at 100W, compared with 23 minutes for the smaller APC model. That difference gives you more flexibility to ride through brief interruptions before starting a shutdown, subject to your actual load.
The extra battery outlet can matter more than the capacity increase. A separate switch or access point may be necessary to keep the NAS reachable from the rooms where you use it.
LED indicators and a silenceable alarm cover basic status checks. You don't get the BX1500M's LCD view of load and estimated runtime, so plan to assess power demand another way.
Choose it when your network has several separate boxes or you want more runtime reserve without the larger tower. Skip the upgrade if the BE600M1 already meets your measured load, outlet count and shutdown target with room left over.
CyberPower EC850LCD 850VA Ecologic: Best for shared computer desks
- 850VA capacity
- Twelve outlets, six with battery backup
- Three ECO-controlled surge-only outlets
- LCD for battery and power conditions
- Three-year warranty including the battery
A compact choice for a NAS beside a desktop with several peripherals. Keep essential network gear on battery outlets and reserve ECO-controlled outlets for accessories that can turn off with the computer.
Pros
- Six battery outlets and six surge-only outlets
- LCD shows battery and power conditions
- ECO mode can switch off computer peripherals
Cons
- ECO operation requires a USB connection
- No comparable runtime figure supplied for this roundup
CyberPower EC850LCD: choose it for a desk with peripherals
The EC850LCD suits a NAS beside a computer whose accessories can turn off when the computer sleeps. It combines six battery outlets with six surge-only outlets, including three controlled by ECO mode.
ECO operation requires a USB connection and switches off connected peripherals when the computer is off or asleep. Keep your NAS, router and other always-on network devices away from those controlled outlets.
This separation helps on a desk where storage runs around the clock but speakers or a scanner don't need constant power. The LCD also provides battery and power status without depending on a computer screen.
Its standby design uses simulated sine wave output. Check that the connected equipment accepts that output, especially if a desktop shares the battery outlets.
Choose it because the outlet arrangement solves a real desk problem. Skip it if you're buying only for an isolated NAS, and confirm that ECO mode's USB requirement fits your NAS communication plan rather than assuming one connection serves both jobs.
CyberPower ST625U 625VA Standby UPS: Best for compact network corners
- 625VA standby UPS
- Eight outlets, four with battery backup
- Two USB charging ports with 2.1A shared output
- Simulated sine wave output
- Three-year warranty including the battery
A light, compact option for a small group of essential devices. Its four battery outlets fit a simple network, but leave less room for separate switches and access points.
Pros
- Lightest unit here at 5 pounds
- Compact body suits a small equipment area
- CyberPower includes the battery in its three-year warranty
Cons
- Four battery outlets limit expansion
- No comparable runtime figure supplied for this roundup
CyberPower ST625U: choose it for a small equipment corner
The ST625U fits a compact network with a short list of essential devices. It weighs 5 pounds and provides four battery outlets alongside four surge-only outlets.
A NAS, router and modem leave one battery outlet free. Add a switch and separate access point, though, and that outlet count becomes a limit before you consider the total power demand.
This is a standby model with simulated sine wave output. Its two USB charging ports share 2.1A, but charging ports don't establish that a NAS can receive battery status or shut down automatically.
CyberPower includes the battery in its three-year warranty. PowerPanel software is available, though software intended for a computer isn't proof of direct NAS support.
Choose it when its compact size and outlet layout match a small installation, after confirming compatibility and runtime for your load. Skip it if you expect the network to grow or need a supplied runtime figure to make a direct comparison with the APC choices.
Check NAS shutdown compatibility before comparing capacity
A NAS UPS needs a supported way to report an outage and battery status if you want automatic protection. Power from a battery outlet alone leaves the NAS running until someone shuts it down or the UPS stops.
Start with your NAS maker's compatibility guidance for the exact UPS model. Check the supported connection, required cable and behavior of the current NAS software.
USB communication, USB phone charging and Ethernet surge protection serve different purposes. A charging port doesn't provide shutdown control, and a protected Ethernet connection doesn't make a UPS a network management device.
Some NAS systems can share UPS status across the local network. Use that arrangement only when supported, and keep every switch or router in the communication path on backup power.
If your NAS lacks a supported automatic method, decide whether a manual shutdown fits how you use it. For an unattended box, read our guide to why a NAS benefits from a UPS before accepting that compromise.
Size the UPS around watts, VA and shutdown time
Choose a UPS that meets both power limits and your runtime target. VA describes apparent power, while watts describe real power, and neither number by itself tells you how long the battery will last.
Measure the combined draw of the devices you intend to connect to battery outlets. A suitable plug-in power meter can help where your equipment doesn't report power use.
Check demand during active use as well as idle periods. File transfers, drive activity and a shared computer can change the load, so sizing only around an idle reading leaves less room than you expect.
Leave a meaningful margin below the UPS limits for changing demand and later additions. If you plan to add storage expansion or another network device, include it in the plan now.
Don't use drive count as a substitute for power demand. The NAS hardware, drives and workload all affect consumption, and a larger enclosure isn't automatically the heavier load in every comparison.
Our guide to sizing a UPS for your equipment explains how to put watts, VA and runtime together.
Decide how long the NAS should stay online
Plan for a shutdown delay, the shutdown itself and a reserve. A home NAS that only needs to finish its writes has a different runtime goal from storage supporting people who keep working during brief outages.
For example, you might allow a short delay for power to return, then start a controlled shutdown. The battery must cover that delay and the full shutdown process without reaching its limit.
Use the manufacturer's runtime curve at your combined load when available. You can't reliably calculate a new runtime by simply doubling or halving a figure given at another load.
Aging batteries, temperature and recent battery use can reduce the reserve available during an outage. A setup that only just meets your shutdown time when new has little room for those changes.
Treat the LCD's runtime estimate as a planning aid, not a fixed deadline. Schedule shutdown early enough that a changing load or falling battery capacity doesn't leave the NAS rushing to stop.
Put the right network devices on backup outlets
Battery outlets should power the NAS and the network path you still need. Surge-only outlets lose power during an outage, even though they sit on the same UPS.
Write down each required device and count its power plug. A separate modem, router, switch and access point can consume more outlets than a combined gateway.
For local access, the switch or router linking your computer to the NAS matters. For internet access, the modem or other incoming connection equipment also needs power, and your service provider's equipment must remain available.
Our guide to the best UPS for a router and modem helps if keeping the connection online is part of your goal. Backing up those devices doesn't guarantee internet service during an area-wide outage.
Keep nonessential devices off the battery side to preserve runtime. Avoid connecting high-demand appliances, and follow the UPS manual's restrictions for printers, power strips and other accessories.
Don't place always-on equipment on ECO-controlled outlets. Label the plugs and outlets so someone moving a charger later doesn't accidentally move the NAS onto surge-only power.
Set up automatic shutdown while you can supervise it
Configure the shutdown action before leaving the NAS unattended. Begin with a current backup, a charged UPS and a time when nobody needs to write files to the NAS.
Follow the UPS manual for battery connection, placement and initial charging. Connect it as directed, with clear ventilation and access to the controls.
Then complete the shutdown setup in order:
- Connect essential equipment to battery outlets.
- Attach the supported communication cable or configure the supported network connection.
- Confirm that the NAS recognizes the UPS and shows its status.
- Set the outage delay and the supported low-battery action.
- Verify the outage and shutdown sequence using the manufacturers' instructions.
- Check what happens when utility power returns.
Choose a supervised verification method that preserves grounding and follows the equipment instructions. Avoid experimenting by pulling power leads without first checking the proper procedure.
Watch for the actual storage shutdown behavior, which may differ from a full power-off. Confirm how the NAS resumes service after power returns, including any setting that controls automatic restart.
If a desktop shares the UPS, configure its shutdown separately. A cable connected to one device doesn't automatically send instructions to every device receiving battery power.
Avoid the mistakes that leave a NAS unprotected
The biggest mistakes are missing shutdown communication and choosing by VA alone. Both can leave you with a powered NAS that still loses electricity before it stops safely.
Another mistake is assuming that a UPS protects every part of a backup job. If the destination computer, external storage or network link loses power, a transfer can still stop even while the NAS remains online.
Don't count every physical outlet as a backup outlet. Check the labels, and account for large power adapters that might block a neighboring socket.
Don't use every possible minute of battery runtime as normal working time. Saving a little more uptime isn't useful if it leaves too little reserve for the NAS to close its services and stop.
Finally, keep separate copies of important files. A UPS helps with power interruptions, but it doesn't recover accidental deletions, failed drives or files damaged for other reasons.
Keep the UPS cool and plan for battery replacement
A UPS battery needs space to shed heat and regular attention to warnings. Keep the unit out of direct sun and away from hot exhaust air, and follow the manual's clearance and temperature guidance.
Inspect the equipment area when cleaning or changing cables. Clear dust from external vents as directed, and check that heavy adapters haven't loosened their connections.
Record the installation date and review battery status periodically. Repeat the shutdown verification after a battery replacement, major NAS software change or significant change in connected equipment.
Battery life varies with heat, age and discharge history, so a calendar alone can't confirm battery health. The guide to how long a UPS battery lasts covers the signs that replacement is due.
Match replacement batteries to the exact model and follow the replacement procedure. Our APC replacement battery guide explains that process for APC units; check CyberPower's model-specific instructions for its units.
After a long outage, allow time for recharging before expecting the original runtime again. If power remains unstable, keeping the NAS shut down may preserve more protection than restarting it immediately.
Choose the best UPS for your NAS setup
Choose the BE600M1 for a small NAS network whose load and shutdown window fit comfortably. Move to the BE850G2 when an extra backup outlet or longer runtime at the same load solves a clear need.
Choose the BX1500M when a desktop shares the battery load or you want its load display and voltage regulation. Count the battery outlets before adding every part of the office.
The EC850LCD fits a shared desk where ECO-controlled peripherals are useful. The ST625U fits a compact installation with no more than four devices needing battery power, once compatibility and runtime are confirmed.
The best UPS for NAS storage is the one that completes your shutdown plan with reserve left. Write down your essential devices, check compatibility, and use the UPS battery backup buying guide if you need to compare the wider options.
Our top 3 picks at a glance
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Frequently asked questions
Does a NAS need a UPS?
A UPS is useful for a NAS because it provides time for a controlled shutdown when power fails; it can also keep essential network devices running through brief interruptions. It doesn't replace separate backups, and automatic shutdown still depends on a supported connection between the UPS and your NAS.
How big a UPS does a NAS need?
Size the UPS around the combined load of the NAS and every device that needs battery power. A 600VA to 850VA model is a starting point for a small network, but watts, VA limits and runtime all matter; include active drive use and leave room for added equipment.
Can a UPS shut down a NAS automatically?
Yes, if the NAS supports the UPS and receives its battery status through a compatible connection; battery power alone doesn't trigger an orderly shutdown. Check the NAS maker's compatibility guidance, configure the shutdown delay or low-battery action, and verify the complete sequence while you can watch it.
How much runtime should a NAS UPS provide?
Choose enough runtime to cover your shutdown delay, the NAS shutdown process and a reserve for battery aging. Longer operation is useful for frequent brief outages, but avoid planning around a nearly empty battery; use the manufacturer's runtime curve at your combined load rather than the VA number alone.
Can one UPS protect a NAS and a computer?
Yes, provided their combined power demand stays within the UPS limits and leaves enough runtime for both to shut down. Communication needs separate planning, since a USB connection to the computer doesn't automatically notify the NAS; use a supported network shutdown arrangement if both devices need automatic protection.
