Proper installation using push-install or install script should add these packages as a minimum:
SYMCnbclt
VRTSpbx
As well as all the startup and shutdown scripts above.
Can you run pkginfo on above 2 package names?
I have seen users getting away with simply copying binaries across, but then run into issues when they try to patch or upgrade.
If there is no etc/rc2.d/S77netbackup on this client, how is NBU starting on the client after a reboot?
You have selected NBU 7.5 as the version.
Can you confirm that this is the version actually installed on the client?
Check output of:
cat /usr/openv/netbackup/bin/version
If older that 7.x, there will be no packages installed, no startup and shutdown scripts.
Only entries in /etc/services and /etc/inetd.conf.