Can a boot disk be converted to a raid mirror without reformatting?

Today the the original 250Gb SATA drive in my G5 started making some awful clicking sounds and seems beyond recovery. Backups are about 2 weeks old, not too bad.
I replaced that with a new 300 Gb drive and reinstalled everything. I'm thinking of adding a second 300 Gb driver and mirroring everything.
Can I simply add the new drive and create a RAID mirror, or do I need to reinstall everything after creating the mirror? I wasn't able to find anything that mentioned that process.
Thanks,
Michael
PowerMac G5 Dual 2.0 GHz   Mac OS X (10.4.3)  

Problem with mirrors is it instantly copies everything that's written to the first drive and people have had problems booting from a mirror.
What you need instead is to auto-clone your boot drive occasionally and make daily auto-backups of certain folders.
This way not only do you have a hardware protection, but software protection as well. You can go back to a previous OS version if you need too, you can boot from the clone if you need to, even reverse clone.
So you have more flexability, mirroring is good for one time data captures that a hardware failure is not a option.
A great piece of software clone/backup is Deja Vu
Read how to do this and more text file here

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