I have a simple mirrored raid setup (just two 1TB drives) with a 1TB Time Machine Drive. I ran Repair Disk Permissions last night and then shut down (Onyx told me to after it scanned my startup volume). Today I unplugged my MacPro (it was already off) to plug in another computer for a few min, and when I brought it back up it took a while to boot so I went into disk utility and it started rebuilding the RAID. Why all of a sudden would this happen? I am worried, because this computer is my livelihood. The Time Machine Drive is up-to-date, so i'm not sh*ting my pants right now. Any recommendations on backing up hundreds of gigs of photos? I was thinking of getting a Blue Ray burner.