+`--pool` `<string>` ::
+
+Backup all known guest systems included in the specified pool.
+
+`--prune-backups` `[keep-all=<1|0>] [,keep-daily=<N>] [,keep-hourly=<N>] [,keep-last=<N>] [,keep-monthly=<N>] [,keep-weekly=<N>] [,keep-yearly=<N>]` ('default =' `keep-all=1`)::
+
+Use these retention options instead of those from the storage configuration.
+