diff --git a/hosts/clerie-backup/configuration.nix b/hosts/clerie-backup/configuration.nix
index 43612e1..00c9e7a 100644
--- a/hosts/clerie-backup/configuration.nix
+++ b/hosts/clerie-backup/configuration.nix
@@ -45,13 +45,18 @@
         "/mnt/clerie-backup"
       ];
       doInit = true;
-      repo =  "u275370-sub2@u275370.your-storagebox.de:./clerie-backup/" ;
+      repo = "u275370-sub2@u275370.your-storagebox.de:./clerie-backup/";
       encryption = {
         mode = "none";
       };
       environment = { BORG_RSH = "ssh -p 23 -i /var/src/secrets/ssh/borg-backup-replication-hetzner"; };
       compression = "auto,lzma";
       startAt = "*-*-* 04:07:00";
+
+      readWritePaths = [ "/var/lib/prometheus-node-exporter/textfiles" ];
+      postPrune = ''
+        echo "backup_replication_hetzner_last_successful_run_time $(date +%s)" > /var/lib/prometheus-node-exporter/textfiles/backup-replication-hetzner.prom
+      '';
     };
   };