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The NetBackup Policy Execution Manager (nbpem) is a service that starts when NetBackup is started and remains active until NetBackup stops.
The nbpem command determines which jobs are due based on defined policies and the previous backup images. nbpem creates Policy/Client tasks and determines when jobs are due to run. If a policy is modified or if an image expires, it is notified and the appropriate Policy/Client tasks are updated.
In addition, nbpem does the following:
Determines a policy's priority that is based on how overdue the job is.
Ensures that the policies are scheduled within the windows in which they are supposed to run.
Cancels the policies that are queued, late, or outside the parameters of the scheduled window.
Handles any policy changes and then updates the policies that are due to run.
Initiates more attempts if a particular job stops part way through the backup.