I am about to upgrade my 13" Air to a new 13" Pro (retina) Although I have Time Machine backups I'm considering a clean install on the new machine, simply in order to be sure that any oddities I may have accumulated over time are not transferred to my shiny new machine. However, I have many thousands of files to transfer (most are on iCloud) Also images and music files. My guess is that once I connect the new machine to iCloud these will all update automatically. What I'm less clear about are my web site favorites, user names, passwords etc. How can I move these over?