[RKDinOKC]

The only thing mirrored boot drives has done for me is let me know I need to replace my boot drives. It tells me the Raid is degraded, I get new drives, format and restore from my bootable backup drive(s). I also keep a time-machine backup which is hourly retrievable. And a nighty bootable backup to an external raid.

Computer commandment #2. One, two, three many backups.

The time machine backup came in handy. A company had a vindictive employee that put trash on their web site. I just used the time machine backup to go back to just before the employee trashed the site, restored it, and changed the passwords. They are happy as larks.