Backup files from USB

I am using Norton Ghost 15 trial, i want to backup files from USB to USB, when i try Norton Ghost says that i only can backup from local drives, when i use another option (backup HD files to HD or something like that) it says that i first have to activate the product, can somebody tell me if i can backup from USB to USB (files) because its a very important isue for me (the program is not cheap):smileyindifferent:

I am using Norton Ghost 15 trial, i want to backup files from USB to USB, when i try Norton Ghost says that i only can backup from local drives, when i use another option (backup HD files to HD or something like that) it says that i first have to activate the product, can somebody tell me if i can backup from USB to USB (files) because its a very important isue for me (the program is not cheap):smileyindifferent: