Command is SYSDUMP
Taking this from an old weekly/daily job:

!FILE SYSDUMP;DEV=TAPE;NOBUF;DEN=6250
!FILE SYSLIST=$STDLIST
!SYSDUMP *SYSDUMP, *SYSLIST
N
0
 !FILELIST;ONERROR=REDO;FILES=30000;PROGRESS=5
YES

I believe the prompts are
ANY CHANGES?                    N
ENTER DUMP DATE?                0   <<zero>>
        return  Dumps config,MPE, but no accounting structure or files.
When using this for COLDSTART
                the accounting structure and files remain intact. When
RELOAD, the accounting
                structure and files are lost.
        futuredate      Dumps config,MPE,accounting structure, NO Files
        backupdate      Dumps config,MPR,accounting structure, all files
modified since this date.
        0       Dump config,MPE,accounting structure, specified files.
ENTER DUMP FILE SUBSET(S)?      << store parameter list >>
        a return here is the same as @[log in to unmask]@
LIST FILES DUMPED?              Y


Using this for system backup makes each backup set (1st reel) a cold
load tape.
For system backup, our FILELIST would be
@.PUB.SYS,@[log in to unmask]@[log in to unmask]
For CLT, our FILELIST would be
        @.PUB.SYS
        @.NET.SYS
        @[log in to unmask]
        @[log in to unmask]
        @[log in to unmask]
        @[log in to unmask]


*********************
* Keven Miller   KC7LYD
* [log in to unmask]   (Salt Lake City, Utah, USA)
* ICQ 5721825
*********************