I am buying a mid-2017 27" soon, and it will be replacing a late-2012 iMac with 3TB Fusion. Everything I am reading, SSD is the way to go this time, and was thinking the 1TB SSD. But I am confused how I can fit everything into an SSD. Currently I have 812GB free of my 3TB Fusion, with the largest folders: Documents - 180GB Movies - 336 GB Music - 1.11TB Pictures - 674 GB I use the computer mainly for photos (Mac Photos) and video editing (currently iMovie, moving to Final Cut). I can easily get an external to put Documents & Music, but am worried about speed if I also put Movies & Photos on an external. Can someone enlighten me how to spread out my folders on the internal SSD and external options?