How do booth my computer from my backup disk?

I am using Silverkeeper on a LaCie firewire external drive, and have backed up regularly every week for the past few years. As I am getting ready to install Leopard I would like to find out how to use my backup to restart my computer in case the installation has problems. Specifically, what key do I use to start from the external drive? As an example, to start from the installation disk I press the C key.
Thanks!
Ruth

First, you need to get a program that will make bootable backups, such as SuperDuper! or CarbonCopyCloner, then use them to back up.
To boot from an external disk, hold 'option' during boot. All boot volumes will be listed.
One note: before upgrading to leopard, unplug EVERYTHING from your computer except for keyboard, mouse, and the power cord. That will help avoid problems during installation.
Good luck!

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HideTo restore the entire library from an external backup disk
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