Today my new iMac arrives I will want to migrate all my apps and stuff over from my 2011 Mac Mini (using Migration Assistant, I assume.) Currently I have an 256GB SSD and 1TB hard disk in my Mini. All my programs are on the SSD and all my data - music, pictures etc are on the HD. My new iMac has only a 256GB SSD inside. I am putting all my data on an external 4TB hard disk. How do I ensure when I do the migration that my Aperture Library and iTunes library (for example) end up on my new external hard disk. I don't want Migration Assistant trying to put 700GB of data onto my new SSD! I wonder if some wise soul could offer some advice please? I should add that my iTunes library file is currently on my SSD but the music files themselves are on the hard disk. Basically all I want to do is to swap my entire Mac Mini over to the new iMac "as is", and am wondering what is the easiest way to do it.