01 January 0001
If using the Wiser Hub and Zigbee devices, settings are stored on devices and in the cloud hence there is no loss of settings. When power is restored everything that was on when power went off will come back in the off state and will go through standard warmup for each device. The Wiser by SE app will then update the status of the devices to off.
If using BLE devices (Iconic Connected 10AX switch, dimmer and socket), the only setting that will be lost after 6 hours or more with no power is real time and geolocation (used to control schedule and sunset/sunrise time).