What is the best way to store data while offline?

[peekay123]

@TylerB, take a look at SPIFFS which I have testes successfully on a 1Mb SPI flash:

Suggestions for using external flash SPI

here is a quick example of a particle photon using SPIFFS to store a downloaded file from the internet (actually a jpg file file) but it can be a text file or html file… The code is far from optimal but it’s working.