@Wayne-TP Thanks.  I have the Tapo P110 according to the app.

I set the Schedule in the app and time zone is fine.  The blurb indicates the schedule will run with no internet connection.

There was a power outage for a few hours the day after the last energy record in Feb.

I've just simulated a power cut at the TAPO and switched back on.  It will be interesting if the light switches on later.  I suspect it will as I have the network back on.

The tech info in the manual is particularly sparse - as is usual with most tech now days.

With the power off, the app doesn't seem to hold or record the previous history.  After reinstating power, the historical data reappears.  I would have expected the P110 to only hold some recent data and transfer older data to the app. 

For example, I have a 12v battery monitor in my car and that just holds a month or so of data, and app retains data for as long as required.

So how much data does the P110 record and retain??  Plus how accurate is the clock in it??  And does the Tapo have a rechargeable battery memory??

  @Wayne-TP 

Thanks again. 

This is the link:

The default status is set to resume schedule. Thanks for reminding about the cloud. Does the plug have a limit on data stored before a network is restored and it can upload?  

Would it be worth submitting to tech support by email? 

  @Wayne-TP 

Thanks again. I contacted support and was told how it works. The Tapo doesn't appear to have a mechanism, battery or capacitor, to maintain the clock for a few hours during a power outage. 

And I'm still waiting on how many days energy data it can store. In days of old, this sort of info would be in the instructions/tech data.  Such is progress.

I go skiing and boating for several months of the year and don't leave a network on.