Apple Thoughts: Home Directory in Cross Hairs When Upgrade to Snow Leopard

"A serious data-loss bug is affecting a small percentage of users who have upgraded to Snow Leopard and use guest accounts. Though Apple says the bug is "rare," it is working on a solution."

This was creeping up in reports in September, and what has happened isn't too much fun. If you update from Leopard and your guest account is enabled, then you run the risk of your home directory being wiped clean. Apple says they are aware of the problem and are working on a fix. No real fix other than making sure you don't have your guest accounts enabled when you upgrade, and to make sure you have a back up of all your data before you do the upgrade. You do have a back up line ready don't you?