Hello @Community member ,
You can refer to the example within STM32CubeU5 MCU package:
\STM32Cube_FW_U5_V1.1.1\Projects\B-U585I-IOT02A\Examples\RTC\RTC_Tamper\
This will help you on the configuration of the tamper detection with backup registers erase.
Hope my answer helped you!
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Imen
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