Update Function

I upgraded to 3.0.3 from 2.x and I can't figure how to enable the old 'update' function. In reading the help it seems that there is no way to do this. Let me explain:

Lets say you want to copy everything from S that is newer than D. Reading the help you would use the Copy function using file checks. The only problem with this is that if D is newer than S, S gets copied over D. This is not right. If D is newer than S, I don't want it overwritten, D should remain and nothing should happen.

So how do I enable the old 'update' function? It's really unclear.