Hi all. I recently lost all my data (music, pictures, tax returns, resumes, everything) on my iMac which was not backed up. (I know) I have sworn that this will never happen again and my mac pro is on its way with 4 250 GB hard disks. I will use the Mac for Aperture and general use. No video editing. My question to the forum is: What is the recommended configuration of these four disk to ensure that I never lose my data ever again? I'll use the OS X software RAID for any RAID configurations. I've read the forums and it seems the general best practices advise against a RAID 0 for the startup volume. I'm thinking RAID 1 (mirrored) for the startup volume and data storage. Then using the third disk for Apple Backup based backups with weekly fulls and daily incrementals. I'm not sure what to put on the forth disk. I value stability over performance. Thanks in advance.