SunOs - Disk clone

Hi All,

I wonder if anyone can point me in the right direction.

I'm trying to keep an an early 1990's IPX based PCB CAD system operational. I 
have another complete IPX which can be canibalised for hardware spares, but 
no copy of SunOs 4.1.3 or the CAD package that runs on it. Even If I had I'm 
not sure that I would be able to install and configure it without any 
manuals.

Both IPX's have had the NVRAM hack and now have a 1/2AA lithium cell that 
should keep the clock ticking until I'm in a box!

My question is can I somehow copy the entire disk so that in the event of the 
disk drive failing I can rebuild the system.
The drives in both the IPXs are the same - SUN424.
I have an Archive Viper QIC150 tape drive.
An Exabyte EXB-8500 tape drive.
A SUN CD ROM drive.
A non-SUN SCSI external drive box and some SCSI disks in the 1 to 2 GByte size 
range.
Network cables +AUI -> 10baseT adapters.

Any help would be much appreciated.
Thanks.

Regards to all on Suns@home.
Martin Nichols, Surrey UK.