yes u can install the client remotly, under the folder /usr/openv/netbackup/client/ you will find the client u need, get it to one of the folders (OS version) u want to install and run the script ftp_to_client to copy the files first then the install_client <hostname> to perform the installation.
If you need to learn more I recomend you to read the Netbakup Admin Guide Unix/Windows, is always a good start, even after the regular training.
Regards