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This backend will keep all updated data in RAM and persist the data between reboots using flash memory. Using only flash memory would result in a slow backend that would decrease the lifetime of the flash memory, using both we can reduce the several cycles of erase & write into flash and keep the performance of the backend almost as fast as the RAM only backend. Note: Do not use this backend on a sector from the same flash memory bank as the memory bank that STM32 read instructions or it can block the CPU from fetching instructions from flash during the erase and write operations and cause your drone crash.