Does esp8266 save old sketches?

[sevenoutpinball]

@SteveMann

OTA, as I understand it, only works if you have not used more than half of your progmem

I guess I am within the limits
Sketch uses 344096 bytes (32%) of program storage space. Maximum is 1044464 bytes.
Global variables use 34808 bytes (42%) of dynamic memory, leaving 47112 bytes for local variables. Maximum is 81920 bytes.