Make sure that the device you want to use to perform the backup is varied
on. Take option 8 (Work with status) from the Work with Devices (WRKDEVBRM)
command to check the status of your device.
Be sure that the media you use for this backup is in the appropriate media
class. Use the class name that is identified in the Media
class field in the system policy.
To begin the backup, type STRBKUBRM CTLGRP(*SYSGRP) SBMJOB(*NO) at any
command line and press Enter.
Once the *SYSGRP backup completes, review
the job log to ensure that the save completed successfully. To display the
job log, enter DSPJOBLOG at a command line, and then press F10 to see the
details.