s_john
I have contacted someone-I-know at Veritas.
The absolute oldest NBU version on their internal download site is NetBackup6.0MP4.
So your only hope is that someone else in this forum have a set of old cd's somewhere in the back of a cupboard...
Holding thumbs that someone maybe able to assist.
I really feel sorry for backup admins who are expected to backup applications and OS that is no longer supported by any vendor.
I would personally push back on this.
Ask system owners to create an NFS share on a supported system.
Create a dump of data to be protected on the share, and then backup the dump-files with currently supported NBU software.