My personal library based and inspired by krzychb's EspSaveCrash
The main difference is that my implementation calls EEPROM.begin() when the sketch is started, instead of when an exception occurs, because once an exception occurs the system might be low on memory causing EEPROM.begin() to fail.
Refer to krzychb's EspSaveCrash for details.
More projects at coertvonk.com