I am old school. Across major versions, I back up my files, create the install media, and clean install from that. By the way, Yosemite runs really well on my

I am old school. Across major versions, I back up my files, create the install media, and clean install from that. By the way, Yosemite runs really well on my MBA. The only thing that bugs me is the hideously ugly folder icons.