External HDD File Back up
I just purchased an external HDD on which I planned to back up my internal HDD. When I cut and paste all the files from C: into the external, it only shows that it is copying approximately 87gbs. However, when I click properties on my C: and look at the amount of space that is already being utilized it is around 170gbs. What is taking up all that space and why isn't it being copied onto my external? Thanks.