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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.
@nicoboss
edit to the previous message :
after a deeper investigation thanks to the storage stack in the IDE, i found the files responsible of the failure, removed them and re-installed them. Backup is now working fine. A luck it actually backups the file in the same order they are sorted in the storage stack (or at least it seemed so) :)