diff --git a/hosts/hainich/configuration.nix b/hosts/hainich/configuration.nix
index 3e98b57..bd4b75a 100644
--- a/hosts/hainich/configuration.nix
+++ b/hosts/hainich/configuration.nix
@@ -122,7 +122,7 @@
     pruneOpts = [
       "--keep-daily 7"
       "--keep-weekly 5"
-      "--keep-monthly 12"
+      "--keep-monthly 3"
     ];
     repository = "b2:tardis-hainich:system";
   };