The HamClock Client uses an "EEPROM" file to store configuration settings. It is located in ~/.hamclock/eeprom of a client installation.
See hceeprom.csv for the definition of all the data elements in the file. It is created/updated with generate.sh.
The objective for documenting this file is so users can switch to other HamClock implementations and maintain their configuration.
NB: it is called an EEPROM file for historical reasons, as it was originally derived from the ESP8266 implementation that actually did use EEPROM to save settings.