I want to upgrade to Snow Leopard, but I'm worried that all of my data will get erased. I've basically just finished getting all of my stuff onto my MacBook, and don't want to have to start all over again! Also, does Snow Leopard come with iLife? If not, will the applications disk that came with my MacBook still work to install the iLife applications? If I do need to start over, can I use Time Machine to be right back where I am now, but on 10.6?