Just discovered the PBS Prune Simulator while looking at the pve documentation, really nice. Maybe add the option to create not only scheduled backups but also adhoc backups? That would help to visualize the scenario mentioned in the pve-docu:
16.5.2. Retention Settings Example
…
keep-last=3
- even if only daily backups are taken, an admin may want to create an extra one just before or after a big upgrade. Setting keep-last ensures this.