Atmel S21 RTC-calender clock restore after backup

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Hello friends of the atmel family, I have set the clock calender(MODE2) on the current time and date, but everytime I wake up after an period from the backup Mode, I loose my date and time. I use as clock source the RTC_CLOCK_SELECTION_ULP1K. Is there any chance that the clock has still the information after the backup mode

i tried to exclude the reset in the init function and searched in the power.h file for a function to disable the reset of the clock

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