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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Argh, sorry. That's extremely surprising with newer firmwares.
Do you get any kind of obvious error from the backup tool if you look on the developer console? I wonder whether somehow it could be made a bit more resilient.
Otherwise, maybe connect with the Web IDE and pull out any files that contain data you want to keep, and then do an 'install default apps' on it