amazon fire stick backup

i have a amazon fire tv stick. was on youtube to see how to do a backup on it . on youtube is asking for es file explorer . but i cant download es file explorer . went trying to download it .a popup come up saying . purchase failure for your covenience all purchases are completed with your amazon 1-click settings we could not complete your order because you do not have a valid payment billing address set up in your amazon accout please update your billing address by going to http://www.amazon.com/mykps in a web browser and try again
or can i plug the amazon fire in my computer to make a backup off of the fire stick to make a file?