I'm gonna play the part of being ignorant here as I can't seem to figure this one out. Since getting Snow Leopard I've started using Time Machine. I have an external 160GB that I normally like to connect once every 2 weeks to my Mac. 1st Thing: I keep getting pop-up notifications like on the 10th day since syncing teeling me to connect and backup using Time Machine. Anyway to stop that? 2nd: After a month of me using Time Machine and backing up like every few days this first month around during my last attempt to use Time Machine, with my external HD connected it said there wasn't enough space to backup using Time Machine...I don't get this; does this mean I have to open up Disk Utility and do a zero, 7 or 35 pass thing before I can use my external HD to use Time Machine again? If so that blows. But then again, don't feel Apple would make its users take that route...so, what am I missing here?