Monthly backup runs every week
This Article (as well as NBU Admin GuideI) explains how Frequency scheduling works:
NetBackup Frequency Based Scheduling
Have a look at the diagram in above Article that I copied from an older NBU Admin Guide.
It explains the process that NBU goes through to determine if a backup must be submitted.
When backup window opens, NBU checks when last there was a successful backup for this schedule.
How much time has elapsed since the last successful 4-weekly backup?
If more than 4 weeks, this schedule will take preference over the weekly schedule, as per my explanation in your previous post: Backup policyIf you want the Monthly schedule to run on a specific weekend (e.g. last Friday of the month), rather choose Calendar scheduling for the Monthly.
Mixing Frequency and Calendar schedules used to 'misbehave' in previous versions of NBU where Monthly and Weekly both ran.
What we did to fix it was to open the backup window for the Monthly about 10 minutes before the Weekly.
So, when the Monthly is already active and the backup window for the Weekly opens, NBU would see that there is already another Full backup running and skip the Weekly.
