How do you manage 2 apple ID's in iTunes?
I've been an apple user for quite some time but my wife is making the transition to an iPhone from an android. Since we have 1 computer, a MacBook Air, I was wondering how you can manage both phones/apple Id's using 1 iTunes? I do not want to blend her contacts, calendar, appointments, apps, photos and music with mine so they need to be kept separate but I want all of her stuff and all of my stuff backed up and available on the one MacBook Air.
Thank you in advance for your help.
MacBook Air, OS X El Capitan (10.11.1)