EEPROM writes

[languer]

Look at the following threads:

• Saving variable(s) contents before power is removed
• PIC power backup with "super capacitor

Ideally, for content saving before a power failure, you would monitor the supply voltage and only save contents to EEPROM when a power failure is detected. Of course, this means you have to keep the PIC alive during the content saves (the links provide this info).