`keep-last` or, in case `maxfiles` was `0` for unlimited retention, by
`keep-all`.
+
+Prune Simulator
+~~~~~~~~~~~~~~~
+
+You can use the https://pbs.proxmox.com/docs/prune-simulator[prune simulator
+of the Proxmox Backup Server documentation] to explore the effect of different
+retention options with various backup schedules.
+
Retention Settings Example
~~~~~~~~~~~~~~~~~~~~~~~~~~