Mirrored Raid on Startup Drive?

Can I set up a Mirrored RAID with my Startup Drive without loosing the data?
I have a G5 Dual 1.8 running the latest OSX. I want to add a second internal HD, then setup a Mirrored RAID from my Startup Disk to my newly installed second internal drive. How do I set up this RAID without loosing anything on my startup drive? The new Drive will be the same size as my startup drive. I want the second drive as a backup startup drive.
Kevin Hawkins

Hi Kevin Hawkens;
What do you expact to gain by having a mirrored RAID?
Allan

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