Trying to have my text file saved even after power is removed

Using Arduino Project Guidance
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This is what I'm working with right now, going to make this portable with a battery but also don't want to lose all my saved key strokes once power is removed, trying to have some sort of safe guard if power is lost to were i can just pop out the micro-sd card and read my saved keystrokes on a text file or something

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the reference showed a SD card module - use that if you have one
you could use the ESP32 Preferences library which saves to the ESP32 on-board NVM
however, it has similar problems to EEPROM with limited writes
consider an FRAM which has practically unlimited writes

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So, save your keystrokes to the sd card maybe once every 10 minutes or use a backup battery and write to the sd card when main power is lost.

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