The first thing to do before doing a system save is have your CL program issue a command 'PRTSYSINF' and copy the spool file(*LAST) to a data file. You will then have a backup that will include all of your critical system parameters and values. This is especially critical for disaster recovery.
Code
PGM
DCLF FILE(OUTQPF)
MONMSG MSGID(CPF0000 CPF9999)
CHGJOB OUTQ(QGPL/SYSOUTQ)
/* PRINT SYSTEM INFORMATION 'IBM' COMMAND */
PRTSYSINF
CPYSPLF FILE(QPRTSPLQ) TOFILE(OUTQPF) JOB(*)
SPLNBR(*LAST) TOMBR(PRTSYS) ENDPGM
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