Hey! I just have a quick query about Leopards Time Machine feature. If I have an internal drive which is 120GB how much space would I need on an external to use for Time Machine? Also, could I partition my external HDD to have some of my music and movies just on there normally and still use the other partition for it? Final Q is does the HDD have to be plugged in all the time b/c I often take my Macbook to school/downstairs/shedio/etc. Would it just sync whenever it was plugged in with anything that had changed? Thanks!