I got an alert from Dropbox on my macbook air that my hard drive was almost full, that I should "sync" something. I make it a point to transfer nearly everything I create (documents, photos, videos) to my Dropbox account so I take up little to no space in my computer hard drive. Is there a way to do this, i.e., keep my files in my dropbox ONLY so that I can have ready access to them from any device without taking up additional space in my hard drive? Thank you in advance.