It is recommended to back up the entire Deliver database, before making any kind of mass changes.
This would be accomplished by running RMODBASE UNLOAD:
//XXXXXXXX JOB ...
//RMODBASE EXEC PGM=RMODBASE,PARM='DLVR_HLQ' <=== MODIFY DB NAME
//STEPLIB DD DISP=SHR,DSN=DLVR.CVDELOAD <=== MODIFY, IF USE
//SYSPRINT DD SYSOUT=*
//RMOUNLD DD DSN=XXXXXX.XXXXXX.RMOUNLD,
//SYSIN DD *
The above will put the database to a flat file, which could then be loaded to a new database (using RMODBASE LOAD, under a different name), whereas then the Deliver RMOUTIL utility could be used, to copy definitions from one database to another.