Hi, Ordered a new 27'' 3 TB iMac,moving from a Mac Pro with 22 TB internal storage and El Capitian. My use is simple web browsing,music,video(Apple TV)and photo storage. My main issue is huge amounts of duplicate files I'd rather not have on the new machine,plus any ideas for media storage-currently have an insane number of external drives,including two 4 bay USB3 housings. Also any must have software you love that I should consider. I really appreciate any thoughts on setting up the new machine and keeping it organized. Thanks so much!