In this podcast, Jonathan Simeone walks us through the process of excluding items from your Time Machine Backup. This may be useful if you want to reduce the size of your backup by excluding temporary, duplicated or unimportant files.
Thank you for this great tip. I just used Time Machine for the first time earlier this morning. I'm at my parents' house for the weekend, and a sister let me connect her external drive to my MacBook. Everything seems to have gone as expected, and Time Machine is very accessible. I've got a Genius Bar appointment tomorrow afternoon, and the confirmation email I received last week told me to do a backup. I'm definitely purchasing an external drive in the next few days.