diff --git a/configuration.nix b/configuration.nix
index 9443fb9..e2ae050 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -43,4 +43,13 @@
       "30 2 * * * /run/current-system/sw/bin/nfs > /etc/nixos/auto_update.log 2>&1"
     ];
   };
+
+  # https://nixos.wiki/wiki/Storage_optimization
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+  nix.optimise.automatic = true;
+  nix.optimise.dates = [ "Mon *-*-* 05:00:00" ];
 }