Offline smart home resilience: use a local hub to keep lights on

Many accessories connect straight to Wi-Fi and fetch their instructions from the maker’s cloud server. That makes them easy to set up, but it also means they often can’t store or trigger automations by themselves. When the internet or your router has a bad moment, they may hold their last state or stop responding, and some won’t even switch on or off at a scheduled time.

Even a simple voice command can take a long trip. Ask an assistant to turn on a smart plug, and the request can leave your house, pass through your internet provider to the assistant company’s data center, then get handed to the plug maker’s cloud before anything happens. The whole round trip usually takes under a second, so you never notice it until one link fails.

And links do fail. In June 2025, a bug in Google Cloud Platform caused a three-hour global outage that took Google Home and Nest services offline around the world.

A hub is a small box, or a feature built into another device, that acts as the central controller for your gadgets. Most hubs still use the internet, but they can save and run many automations locally, so your routines keep going during an outage as long as the hub has power.

A few things still need the internet even with a hub. Automations that rely on live data, such as current weather, won’t work, and neither will features that share data outside your home.

The hub you already own may do more than you think:

• Apple Home: a HomePod or Apple TV can act as a home hub, handling local automations as well as remote access.
• Google Home: since January 2025, Google has controlled Matter devices locally through a system it calls Home Runtime. Some automations now run on its hubs too, but Google doesn’t say which ones, and its own terms say automations depend on a working connection and its services.
• Home Assistant: this open-source software runs on a box in your house and keeps your schedules there. Its official Home Assistant Green unit plugs into the router over Ethernet and costs around $200, and a Raspberry Pi can do the same job.

Matter, the shared standard backed by Apple, Google, Amazon, Samsung and others, was designed around local control. A feature called multi-admin lets one device belong to several controllers at once, so you can keep a familiar voice assistant while a local controller handles the schedules you can’t afford to lose.

The most dependable hubs talk to devices over Thread, Zigbee or Z-Wave rather than Wi-Fi. All three are low-power mesh networks, which means each device helps pass signals along, so gadgets far from the hub stay connected. A single hub can usually link many compatible accessories at once.

Thread has an edge because some Wi-Fi gear can double as a Thread border router, the bridge between the Thread mesh and the rest of your home network. Zigbee hubs such as the Philips Hue Bridge also have a strong track record.

There is a trade-off. These radios carry very little data, so they suit lights, locks, plugs and sensors, while cameras and streaming devices still need Wi-Fi. Matter also works over Thread and Wi-Fi but not directly with Zigbee or Z-Wave, so those devices still need their own hub or bridge to join a Matter setup. If you are buying a new hub, pick one that works as both a Matter controller and a Thread border router.

A hub keeps routines alive without the internet, but not without electricity. The perfect answer would be a fully hub-based home plus whole-home battery backup, but those battery systems cost thousands or even tens of thousands of dollars. For most households that only makes sense if your job or safety is on the line.

A cheaper middle path is to look for devices with their own built-in backup:

• The Philips Hue Go lamp links to a Hue Bridge but also has a battery, so it keeps shining for hours without mains power and can run some basic light effects from a button on the lamp or over Bluetooth from an app.
• Smart thermostats keep following their last schedule as long as the heating and cooling system has power.
• Some security cameras save footage to local hub storage, even though alerts and advanced features still need the internet.

If you rely on a smart security system and your internet cuts out often, cellular backup is a must, so the system can still reach you during an outage.

You don’t need to rip everything out. Start with the devices that matter for safety and daily routines, such as locks, key lights and sensors, and make sure they connect through a hub instead of relying only on a cloud app.

When you shop, don’t just grab the cheapest or best-looking option. Check whether a device can join a local hub, whether it uses Thread, Zigbee or Z-Wave, and whether it has any battery or manual backup. A soundbar or light panel going dark for half an hour is fine. A lock or alarm doing the same is not.

Be careful with smart speakers and displays from Amazon and Google. Matter lets them run some commands offline in theory, but in practice those companies have not made much use of it, so don’t count on them alone for offline control.