Save Project to the cloud

Hi All

I know the answer to this will be blindingly simple but as for now I can not get this to work.

I want to be able to work on a project on the office desktop computer which has  autocad architecture 2014 installed and save it to the cloud. Then when I am on site  I want to be able to continue working on the same  project from my lap top which has autocad architeture 2013 installed.

Then again save it to the cloud so that when I get back to the office, I can continue to work on the same project  which has all the changes that I have made from my laptop while on site, with my desk top.

Up to now I can not get this simple thing to work?

Can some one help please all I want is to be able to work on the lastest updated version from two computers.