Hello, I'm thinking of installing Leopard on my MacBook, and I have a couple of questions about the recommended process. First, I'd like to back my data up to an external hard drive (even though I plan to do the archive and install). Is there a simple, easy way to do this? Would the quickest way be to make a .dmg of my whole HDD and transfer it to an external HDD? Also, is there a way to copy my data in such a way that the drive is bootable (in case something goes wrong with the install)? Second, regarding Time Machine: what is an ideal partition size for the feature? I understand that bigger=better, but I don't want to be wasting space. I have no idea how much space a day's backup of 60GB's worth of data would take. Since I'm also new to the backup deal in general, I'd also like to know how far back one would generally like to keep their stuff. Also, what file system should I format the partition in? I'd like to get this accomplished before I install the operating system, so that everything is set for me when I begin use of Leopard. Thanks in advance.