I alternatively live in two different places, a few month in Europe and then a few months in Asia. In both places I have an iMac with OSX version 10.8.5
I started by copying the complete content of one of the iMacs to the other one; so at that moment they were identical. Now I will be in Europe for some time and work on my machine there.
Once I move back to Asia, what can I do to make my iMac there identical to the one I just left in Europe and vice-versa ?