Decommissioning a media server

are you going to use the same host name or Different host name with fresh installation?

if you are going to use the same host name, you probably need not to do the media server decomm process

because all the configurations are saved in master server.

so do the folllowing

1) deactivate the media server in Netbackup master ( from GUI--> Devices -> Media servers)

2) upgrade the media server OS  (use same hostname) and install the Netbackup 7.6.0.1

3)add the master and EMM server entires in media server 

4) Install OST plug in in media server

5)activate the Media server In netbackup master 

6) recycle the netbackup once

you are done.. test the connectivity and backups..