It has been a long time since I worked on Novell servers (Netware version 2,3,4), however I think this may help
Use the built in Novell mirroring to make a copy of the Netware partitions (your DOS partition backup with xcopy, make it bootable with sys etc).
Shut down the server and remove the mirrored disks,
if something goes wrong swap the production disks with the broken mirror disk and reboot.
I think this will work, Netware 5 addressed issues with mirroring NSS volumes if I am not mistaken.
This is how I do it on Unix boxes running VXVM today.
Here is a link to Novell Support
that talks about recovering from a disk failure. My post above is basicly the same steps however you removing the drives is the "failure."