"Do you want to transfer data from your old Mac to the new one" when you first started up this new MB Pro.
I recently purchased a new MacBook Pro. I need to synch my iPhone and iPad with it but don't know how to "move" everything from the old Mac to the new one. When I connect the iPhone/iPad to the new Mac the on-screen instructions scare me when they mention replacing everything on my iPhone/iPad with what is on the new Mac, which is nothing. I have read the instructions but am confused, mostly afraid I will lose it all. I have backups on the old Mac. I would appreciate any advice or reassurance.