Hi guys, can any1 enlighten me? i just bought an external hard drive, and i want to start using time machine but the idea is abit hard to understand. i know how the timing works. (hourly for the past 24 hrs, daily for the past .. etc etc etc) but im not sure if i should use time machine? my concern is... usually the songs i downloaded will be put into the desktop, after i listen and i like it, i put it in the itunes library folder each week, id probably download 2/3 albums (200mb) so the thing i want to ask is.... during "pre backup time" i have 200mg on my desktop during "post backup time" i moved that 200mb to music library would it mean that i have 400mb in my time machine drive the next time back up? if yes, is there anyway not to waste my time machine drive?