Can someone explain backup schedule retention to me?

[encryptedserver]

My schedule is like this:
sat 09:00
Keep weekly 4
Keep monthly 1
Yearly 1

I just checked today and my monthly backup from 09-30 got deleted which was the last monthly backup from September. I just figured it out that Keep monthly should be 12 and not 1. So the new schedule is:
sat 09:00
Keep weekly 4
Keep monthly 1
Yearly 1

My question is if I keep Yearly 1 does all the backups gets deleted in Jan 2024 from 2023? I want to keep 4 weekly and after that 1 monthly for 12 months.

 

[Dunuin]

I would recommend you have a look at the PBS prune simulator: https://pbs.proxmox.com/docs/prune-simulator/

 

[encryptedserver]

Thanks got it, just disabled Yearly.

New schedule

Weekly: 4
Monthly: 12