I have a 2TB June 2013 Airport Time Capsule coming from Apple today, and I want to know how long it will take for my 2012 iMac to back up the first 135GB. I don't want it to take a long time since I am also getting a 15 inch retina MacBook Pro that I am transfering my info from my iMac to. I want this process to be done within 24 hours. I need to know if I can do that over Wi-Fi or if there is anything that will make it faster.