Caporegime
You can use an external USB drive to backup all the existing saves, downloads, and game data etc, be warned its slow...
And long as the new drive is not over 2 tb ( as larger drives don't play well with rest mode etc ) and is 9.5mm or thinner and a ssta 2.5 " then you're good to go..
Thanks!
What make and models are you guys getting?