Log runtime to EEPROM?

I want to log the total runtime of an application to an EEPROM. But I must
have a secure method to do that if the application get turned of at that
moment when I write the data to the EEPROM.




The runtime is going to be saved to the EEPROM about every 30 minutes or so.



Any suggestions?



I thought of an idea where i save the runtime at two different locations in
the EEPROM + a flag 0 or 1 that indicate where i was able to store the
latest runtime.



.

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