The capacity of johns hard disk is 160 gigabytes. Name the most suitable storage medium to back up the entire hard disk. Justify your choice of storage medium.
My recommendation would be to use an external hard drive as they are very cheap these days and offer a quick and easy to use backup storage solution. Hard disks can transfer data very quickly, are quite portable and are rewritable. He should then store the hard disk in a location away from his computer in a FIRE PROOF SAFE.