I have been running OSX 10.1.5 here on my work computer ever since I started work here, and I just got my boss to purchase an upgrade to 10.3... I am fairly familiar with Macs, but wanted to make sure I was doing everything right before I dove right in and updated something as significant as the OS. I have a lot of important files that I really do not want to lose, and was wondering if it was nessesary to backup my HD, or needed to make sure of anything beforehand. Any suggestions you may have would be greatly appreciated. Thanks!