Ok I am getting ready to purchase a Macbook and keep reading everything I can to lean more about Mac OS X and I can not understnand something about Time Machine. Everything I read on Apple.com states that: "Time Machine saves the hourly backups for the past 24 hours, daily backups for the past month, and weekly backups for everything older than a month. " Does this refer to the actual data backed up on the USB disk or does it mean I can go a couple weeks before plugging into a USB HDD. I love the feature and would like to use it, but, the whole reason I like a laptop is not having to have wires everywhere and not have to keep a portable USB drive plugged in the whole time I am using the macbook. Will I be able to use my PC for 3 hours and then plug a USB drive in and have it "sync" the backup data for the last 3 hours worth of backups? Also, will they be patching the OS so we can just sync to a network drive? This is how I manually backup from my Windoze laptop and think it it is the logical move because who wants to have to keep a freaking USB drive plugged in all the time.