To further explain, with a 200GB storage plan (5 bucks? pretty good deal) I have uploaded my entire Photos Library to iCloud. My intention was to save space on my internal hard drive. My thinking: "Ok, upload all my photos to iCloud, cool. Now boom, delete my Photos Library off my computer and free up around 70GBs!! yay!!" But I don't THINK it works that way. Or does it? Please tell me it does. Now I understand, even if I can't delete my local library, one big point of iCloud storage is the ability to access those photos from my iphone, or other Mac (mini). But still, Rarely do I have a need for this, and to sound like a broken record, is iCloud storage a substitute for my hard drive?