Best Configuration for Multiple Video Captures

Hello,
What would be faster and the most efficient for multiple video captures:
- 9 video feeds written to 3 separate internal hard drives (3 feeds per hard drive)
- 9 video feeds written to 3 internal hard drives in a combined RAID configuration
- 9 video feeds written to 9 separate external hard drives via eSATA
I have a Mac Pro 3.06GHz 12-core Intel Xeon machine that will be dedicated to a security camera application (SecuritySpy). The Mac OS and SecuritySpy will be on one hard drive and send the captured video from nine network HD cameras to the other hard drives. The computer, eSATA card, and all the hard drives are 6Gb/s capable. I also have access to SoftRAID for the RAID configuration, as well as an 8-bay eSATA hard drive enclosure if I choose. There are pros and cons for each of the configurations, but I am looking for the most reliable setup in terms of efficiency and longevity.
“Technological change is like an axe in the hands of a pathological criminal.” (Albert Einstein, 1941),
Dr. Z. 

Just wanted to post the details of my final set up, maybe this will be useful to others looking to do a similar setup:
1. Connected and set up the external hard drive (I bought a Western Digital My Book Pro Edition II 1TB) via Firewire 800 on iMac #1.
2. Set up iMac #1 to backup via Time Machine. Even though the other computers will see the drive, apparently they will not recognize it in Time Machine unless you set it up on the computer the drive is connected to first (I tried).
3. On iMac #2, connect to iMac #1 via file sharing, this is even easier now that you can access any computer on your network under "SHARED" in the sidebar of any finder window.
4. Double-click the external drive. If you don't see the drive, click "Connect as" in the top right of the window and login. It's not necessary to do this, but if you want to confirm you've connected to the network drive, you can go to Finder -> Preferences -> General and under "Show these items on the Desktop" check the box next to "Connected Servers". This will make an icon for the external drive appear on your desktop.
5. Turn on Time Machine on iMac #2. Repeat for any other computers you want to back up.
That's it. So far this has worked great for me. Obviously the backups run a little slower on the computers running through file share, but its a small trade-off compared to either manually moving the drive around or getting three separate drives.

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