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I have never quite figured out how the data logging in the HC2 works. The Energy and Temperature Panels give me access to data from such devices, but I would like to know how the logging is done and where the data are stored. Monitoring my system is important to me, as it controls a vacation home which is uninhabited for long periods, e.g. through the winter season. Here is a fresh example which makes me really curious: December 15 between 5 and 6 am the house lost power (the main intake relay had tripped, probably because of a disturbance or surge in the grid). I was able to get to the house today, and reestablished power on December 18 at 9:50 am. The house is set to maintain temperature at about 11 C through the winter, but without power the temperature had dropped to about 5 C when I arrived. After power was reestablished, all thermostats and the HC2 resumed operation as planned. Now look below at the log from the temperature panel which I was able to retrieve after restart. The three curves on this chart are: Red: Measured floor temperature from a thermostat (220 V powered unit) Blue: Room temperature reading from an Aeotec multisensor (battery powered) Purple: Room temperature (another room) from a Fibaro Door/Window sensor (battery powered) I can clearly see where power was lost, where the purple line does not continue to oscillate. My questions are: Are these data stored in the HC2 or on the Fibaro server? What happens to older data (before December 14 in this case) when power is lost? Why is there a data point at December 17 13:39? The HC2 was down at this time, and the values are clearly just repeats of the last known values from December 15. What parameter controls the frequency with which data from devices are stored?