I am blowing through HD space pretty quickly on my late 2014 MBP..I have a 1TB external drive that I back up to via TimeMachine which is fine for that purpose but I'd like to keep large files off of my laptop so I dont get to zero storage by April. I do aerial imaging from a quadcopter w/GoPro Hero 4 and shoot stills with (as of today) a Nikon D750. What should I add/replace in order to keep space open on my MBP? My MBP is my work and personal laptop but I do travel with it and would like to have access to all files while on the road. How do you handle copies of backups in case a drive is lost/stolen?