How to do a one time backup to usb so can install OS

Hi i have tried several times and i just don't know how to do a one time backup to a usb drive and then install the OS via the usb drive as a clean OS.

 

How is it done?

 

When i go to Windows backup on a clean drive and boot up with a install disc  it never recognises  my Norton one time backup and i cannot install from it.

 

I'm getting another drive to go RAID and i may need to install my OS again. I cannot install my OS to another HD and it has to be a through a usb drive. I have Norton Ghost 14.

 

Thanks