I need help to set up or understand the following

The Linux hardened repository is all up and working. Just need help to set up the backup job since I can't seem to get it in my head...
We want to create a full backup once a month to keep it on the hardened rep. for 6 months. no dailys or weeklys...
How do I set this up:
Storage: Retention Policy 6 RP, Backup Mode "Incremental without synthetic full, "Create active full backups monthly first sunday..."
Schedule: Run the job automatically "Monthly at XX first sunday"
Would this work like intendet?
thanks!