I am looking for a cloud drive type of thing which I can use to open files without the files being downloaded. My mba has only 64gb of space and even dropbox isn't ideal because it still downloads everything to my drive.
Sugarsync might be worth checking out - once you've uploaded everything, you can decide what you want to continue syncing with your computer, so you can turn it off if you don't want it and it will just stay in the cloud...