Hi xaBo,
The issue is that you are trying to unpackage or untar the file to the CDROM, try to copy the tar file to a temp folder give 777 rights to that folder and file and run from there, this is only permits issue and you cannot write to that cd, has you see in:
777: /media/cdrecorder/NBClients/anb/Clients/usr/openv/netbackup/
client/Linux/IBMpSeriesRedHat2.6/tar: cannot execute binary file
tar failed unpacking client_bin.tar.Z on xxxx.
Cannot complete the client install.
the folder where u r trying to extract the binaries for the install are ready only, copy the full NBUClients folder in the cd-rom and sure you will be fine.
Regards