Check one more time whether all sessions (except your own)
have logged off by entering:
Either abort any sessions other than your own that are still
executing, or check with the users and ask them once more to log
off. To abort sessions, use the ABORTJOB command and the session numbers that appear in
the first column on your screen, as follows:
After you have aborted all sessions (except your own) issue
a SHOWJOB command to check that all sessions are aborted.
When the system responds that you are the only session on the system
(as shown below), you are ready to begin the backup.