hey guys, i'm thinking of have a back up of the mac os on the flash drive. i did some research, and it seems the most popular approach is to use the disk utility and restore the leopard dvd image to flash drive and boot from it. just got 2 quick questions regarding this method: 1. i need a full disk image of the mac os, how much space shall i need for the flash drive? 8GB or 16GB? 2. do i have to get a retail version of leopard or can i use the grey installation disks that comes with macbook? any input is appreciated!