I have a source code that I took from a friend, Idempiere, and I can't afford to re-download it as it weights over 2 GB. 

I would like to stay updated to the recent changes done on the source code online repository.

I have installed the Git plugin in my Eclipse Indigo but now I don't now if it is even possible to do that so that it pulls only what I don't have yet and update what I do have.