GO MAIN will take you to the main AS400 menu
Take option 6 = Save
Take option 21 = Entire system
Note you must sign on with QSECOFR authority anddo this from the System Console.
This will end all subsystems so you should have all users off the system.
If you are using a Windows Operating System, you can use the System Restore and the Windows Backup. These software are built in any versions of Windows Operating System. However, you can always prefer to use other external software for backing up files or the entire system.
Select GO SAVE from the main menu
Select Option 21. Entire Save