A schedule that is open all day and night allows a job to run whenever the calendar schedule indicates.

NetBackup determines that a job is due to run by considering when the job last ran successfully and the frequency of the job.

A frequency is not configurable for a calendar-based schedule. NetBackup assumes that an environment requires one backup on each day that is selected on the calendar schedule. Given an open schedule, backups run as soon after midnight as possible to satisfy the daily backup requirement.

See How NetBackup determines which schedule to run next.

See Runtime considerations.