Hey guys, when I'm at my desk I have my MacBook Air connected to devices like my external display, backup drive, speakers, etc. Do you think it's ok to upgrade while it's plugged into everything or do you think I should disconnect it?
You should have everything disconnected, and before you start you should wash your hands in the tears of 42 virgins who've had their hearts broken. Also it's necessary to draw a pentagram around the apple on the cover of your MacBook using Steve Job's blood.
Duh, of course you can leave everything connected. Do you think Apple are a bunch of amateurs?