Quote: "cos after i uninstall games etc, the files i actually need is smaller than the backup drive, after i've backed everything up i format the HDD. why would i need a backup drive larger then the true hdd anyway???"
Well if your backup was smaller than what you had to backup then obviously not everything would fit on it, plus, if you want to make multiple backups in case one backup is corrupted then you'd need a larger backup HDD. Generally your backup drives will hold more space then the data you actually need to store.
"Computers are useless they can only give you answers."