I have a late 2015 imac with an equal partition between OSX and Win10 which I setup through bootcamp. Now that I'm getting a new imac next week, I wana just have OSX installed cuz I run out of room so easily and couldn't afford a 1tb ssd. Is there a way I can install windows on a nexternal SSD drive, transfer all my games to that, and then just plug that in when I wana use windows? My only concern is I have a legit copy of Windows 10 and I do NOT have the key paper anymore so I'm afraid if I try to do a carbon copy to that external SSD that something won't be "legit". Does this make sense? Thanks guys!