Hey Dave, not sure if you simply came across this and started playing with it as a Lockdown project because you were bored, or if it’s of interest as a genuine project?
Storing data in EEPROM is rather old school, and using SPIFFS instead is better because you have more tools/commands available and because it moves the data around to prevent wear of the memory locations (which have a limited read/write life).
Even SPIFFS may start to become old school soon, as the ESP core has a new and improved file system built-in.
The RFID access projects from @Gyromike are quiet a bit more mature. He’s been through a variety of storage options, including an external I2C memory module, but is using SPIFFS…
If you’re looking for a proper project to implement then I think I’d use that as a starting point.
Pete.