A/UX 2.0 is basically the same as A/UX 3.x. The main change is the version of the Macintosh System Software used in the Mac environment.
The following sequence of commands will create a duplicate of the directory structure of the source drive onto the target drive.
While logged in as root, follow these steps:
Step 1
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Mount the drive you want to copy to (target) on /mnt
mount /dev/dsk/c5d0s0 /mnt (Replace SCSI ID and partition as appropriate)
Step 2
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Go to the "/" directory, perform the copy, create the mnt directory in /mnt
cd /
find . -print | grep -v /mnt | | grep -v /lost+found | cpio -pdlmuv /mnt
mkdir /mnt/mnt
chmod 777 /mnt
Step 3
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When the copy is finished, unmount the target disk and perform an fsck
umount /mnt
fsck /dev/dsk/c5d0s0
Now you have a copy of the source drive, complete with the /dev directory.