"Won's recent post on possible configuration corruption caused by OneCare/Forefront reminded me of something that every IIS7 customer should know about: how to backup and restore IIS7 configuration!

No matter whether your configuration file gets corrupted, you make changes you decide to roll-back, you accidentally foo-bar your .config file or some act of terror occurs, some day you'll want to go back to a prior configuration file. Thankfully, IIS7 makes this super easy."