NetBackup uses the install_path\NetBackup\bin\admincmd\bpdbjobs -clean command to delete done jobs periodically.

By default, the bpdbjobs process deletes all completed jobs that are more than three days old. By default, the bpdbjobs process retains more recent done jobs until the three-day retention period expires.

If the bprd NetBackup request daemon is active, bprd starts the bpdbjobs process automatically when it performs other cleanup tasks. The process starts the first time bprd wakes up after midnight. The automatic startups occur regardless of whether you choose to run bpdbjobs at other times by using cron or alternate methods.