Copy from xServe RAID to firewire drive is crashing my OS...

Fellow mac users,
I am a relatively new OS X system admin and I am having a hard time copying files from my xServe RAID to a firewire drive to do an intermittent backup. When I try to copy the files over it crashes the OS without fail. I was wondering if anyone has ever heard or seen of this before? It's rather discouraging when all I'm trying to do is get a quick backup of the RAID which is only 300 gb in size currently.
Our hardware is very good, we have a dual 2.3 G5 model with 3 gb of RAM so I know the hardware can handle a simple finder copy. The only idea I have is to do a "ditto" in the terminal. I thought I'd ask for input from the resident apple sages before trying that. Does anyone have any suggestions or ideas for me?
Thanks for any help,
Thomas
xServe Dual G5 Mac OS X (10.4.5)

Be sure you have the external drive connected when you boot from the installer disc. Use the OS X Installer One disc that came with your MacBook. After you boot from the installer and select your language select Disk Utility from the Utilities menu.
After DU loads select the drive entry (mfgr.'s ID and drive size) for the external drive from the left side list. Click on the Partition tab in the DU main window. Click on the Options button, select the GUID partition scheme and click on the OK button. Set the Format drop down menu to Mac OS Extended (Journaled) and the number of partitions from the Partition drop down menu to one (1). Click on the Partition button. Wait for the volume to mount on the Desktop.
Quit DU and return to the installer. Proceed with the OS X installation. When you get to the part where you select a destination click on the icon for the external hard drive.

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