The Power Failure Setup screen is where you specify what, if anything, HomeSeer should do if there's a power failure.
For example, let's suppose that you lost power during a storm at 11:0am. Let's further imagine that you have an event that is triggered at 1:00 PM, but the power is not restored until 8:00 PM. You would want HomeSeer to look back at least 7 hours so that event was included when determining the status of any controlled devices. If that event turned on a light, the light would be restored when the power came back on. When power is restored, HomeSeer resets its internal clock back the number of hours you entered in this screen, then executes each event while incrementing time. This way, it will run all missed events and update the status of all your devices.
Certain actions are not executed while the catch-up is taking place. Any action that does not affect the status of a device, such as speaking, is not run.
Note that you must enable devices to participate in the power fail recovery process. View the properties of all the devices you want included and check the box "Include in power fail recovery". By default, devices are NOT included. Repeat this process for any events that you want included also.
To get to this screen, launch the web interface, click the Setup button beneath the time and date bar, then click the Power Failure tab.
Click on the graphic below for more information on these settings.