Saving files before clibration

What files do I need to backup before starting the calibration process?

you shouldn’t have to do a backup. when you open machine inspector, it can be handy to copy and paste grbl settings onto a notepad file, in case something goes a little screwy. that way if you accidentally plug in a step setting of 911.231, when it was supposed to be 199.231… (don’t ask me how i know this) you’ll have the default values to refer to.