Do the EP+ devices loose any information without auxiliary power?
The most of information are stored in non-volatile flash memory, so they are not lost even when the device looses the auxiliary power. These information are for example: configuration file, parameter file, events and disturbance records.
The real time clock gets power from a capacitor which can hold enough voltage level upto one week. If the device does not get auxiliary power more than one week long, the time has to be set after switching on the device.