I have roughly 30GB of pictures/videos in the Photos app on my old MacBook. I have purchased the iCloud storage upgrade, so all of these appear on my iPhone and iPad as well. I recently purchased a new MacBook. I prefer to set this new device up fresh, only transferring over the individual files that I want. So I will be transferring over my iTunes library, some documents and then a few movies. What about my photos and pictures? If I add these files to my new MacBook will iCloud Photo Library detect that these are "hard copies" so to speak, and not duplicate them in the cloud? Or do I even need to transfer them over, as iCloud will download the originals to my new MacBook? Seeking some clarification here - thanks in advance.