Backup all known guest systems included in the specified pool.
-`prune-backups`: `[keep-daily=<N>] [,keep-hourly=<N>] [,keep-last=<N>] [,keep-monthly=<N>] [,keep-weekly=<N>] [,keep-yearly=<N>]` ::
+`prune-backups`: `[keep-all=<1|0>] [,keep-daily=<N>] [,keep-hourly=<N>] [,keep-last=<N>] [,keep-monthly=<N>] [,keep-weekly=<N>] [,keep-yearly=<N>]` ::
Use these retention options instead of those from the storage configuration.
+`keep-all`=`<boolean>` ;;
+
+Keep all backups. Conflicts with the other options when true.
+
`keep-daily`=`<N>` ;;
Keep backups for the last <N> different days. If there is morethan one backup for a single day, only the latest one is kept.