I am planning to change my current HDD drive with new intel SSD, so I need to back up all the files on my current disk. The capacity of my current HDD is 320GB, so I made an equal partition, 160GB-160GB. Since there's just 120GB occupied in my HDD, I assume I can back up it with the alternative partial 160GB, sounds feasible? Another problem, after replacing it with SSD, should I just make the internal HDD external, and plug it to the macbook pro using USB to install all the OS and files? I am a newbie, so please help~!!