The FlashStorage_SAMD library, based on and modified from Cristian Maglie's FlashStorage, provides a convenient way to store and retrieve user's data using emulated-EEPROM, from the non-volatile flash ...

ESP_EEPROM An improved EEPROM emulation Arduino library for ESP8266 The ESP8266 family doesn't have genuine EEPROM memory so for Arduino it is normally emulated by using a section of flash memory.