Norton ghost backup on usb flash drive

1) plug in flash drive
2) boot to backup utility (if you use it in standalone mode)
3) select flash drive as destination. You are probably better off backing up to an image file than doing a clone.

From the fact that you asked the question, I guess that you are having some sort of problem doing the above. Where do you get a problem, what are you trying to do at that point, and what goes wrong?