Notice that multiple jobs are in the RUNNING status and as each job completes, a QUEUED job is moved to the job spool device queue and executed.

Recognize that if you use multiple job spools and spool your back-up job, you cannot be assured that all other jobs will be complete before the back-up job is started.

For example the work spool file command (WRKSPLF) USES file name, job, spool file number, creation system, and creation timestamp to identify spool files.