3.1 Perform full backup
Before you attempt any upgrade operation, always fully back up the entire network server. It cannot be overstated how important a full backup of the entire system is for the successful completion of an upgrade.
Back Up Before Upgrade Know that you should always perform a full system backup before attempting any upgrade to the network server.
You also should verify the backup. During verification, you check the contents of the tape against that of the corresponding files on the disk drives. Performing a verification of the backup is usually an option that you can select as part of the backup process. Verification effectively doubles the time that it takes to perform a backup, ...