No typical software HDD / partition imager is compatible with the nForce RAID controller.
Norton Ghost 2005 can backup a single HDD (not even in RAID mode), or RAID via OS drivers, on an nForce 4 chipset, but it can't restore it using the Symantec System Recovery disk (lacks the RAID drivers, almost impossible to 'slipstream' them into the Symantec Recovery / Image restore disc, ala: SP2 to WinXP CD-ROM style), so you need to install the OS then Ghost 2005 just to restore the image anyway.... sort of defeats the purpose no ?
The restore operation takes 2-3 times as long as it would to just rebuild the machine from scratch.
Norton Ghost 2005 uses the PowerQuest format anyway.
Linux wise, bearing in mind that 2.6.x Kernel doesn't like 'RAIDlite' HDD controllers (the ones on typical consumer mainboards, including the nForce 4 and server nForce Pro 2200+2050 chipset), so you need to use Linux software RAID and forget about 'psuedo-hardware' RAID in Windows will let you make images and restore them quickly.
Otherwise look into Adaptec and LSI, etc 'real hardware' RAID (vs hardware just passing to CPU) and see if their cards (typically PCI-X, not to be confused with PCIe / PCI Express) come with image software for their arrays.
Using Norton Ghost 2003, from DOS, using 'GHOST -?' from the command line, and using the base Int 13h mode with faster interface methods disabled (for backup and restore) might work if the total array size is small (not partition size, a 1 GB partition on a TeraByte array won't work for example).
Still you may be able to backup the partition(s) you want even with Ghost 2003, only to run a integrity check on the image to find it corrupt (not made for newer chipsets or processors), or that you can't restore the backups anyway.
I'd just get an external HDD or two, or external LaCie RAID ( http://www.lacie.com ) if you need the redundancy.... and re-install your Operating Systems when need be, using 2-3 Primary Partition OS's with the 'one hand washes the other' system of image backup (within the OS itself), as you can install Windows XP + drivers + image backup/restore software + the images themselves, and boot from, external USB mass storage devices.
The other option is use RAID-5, and remove any (XOR data) HDD, insert a new HDD and rebuild the array... repeat for each disc to make a 'mirror' of your arrary (very dirty, unsafe method).... also requires twice the HDDs (one set in the PC and a 'known good' backup array, numbered by cable / HDD position, outside the PC).
The option in blue is the best I've come up with so far.
I use Acronis 9.0 with my Promise 378 RAID 0 array (ASUS A8V Deluxe mobo) and it works great. When I use the boot CD I choose "Safe Mode" to skip SCSI support and the recovery console loads in three or four seconds. I don't even bother loading the application in Windows anymore since I have to reboot to recover the system partition anyway. I just do everything from the boot CD.