I've had this problem for a while now. I turn on Time Machine and it updates to an external fire wire drive. Every time it updates it scans the drive and then starts backing everything up. But once every thing's copied it keeps on going, right now it's saying "988.8MB of 988.8MB Copied" but the icon is still spinning, and has been for 10 mins after the copying was done. How long should it be doing this for?