diff --git a/modules/common.nix b/hosts/common.nix
similarity index 76%
rename from modules/common.nix
rename to hosts/common.nix
index bc4be3a..b58a876 100644
--- a/modules/common.nix
+++ b/hosts/common.nix
@@ -2,6 +2,17 @@
 
 {
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
+  nix.optimise = {
+    automatic = true;
+    dates = [ "03:45" ];
+  };
   
   # Set your time zone.
   time.timeZone = "Europe/Berlin";
diff --git a/hosts/cube.nix b/hosts/cube.nix
index b0abedd..6ae5a91 100644
--- a/hosts/cube.nix
+++ b/hosts/cube.nix
@@ -4,7 +4,7 @@
   imports =
     [ 
       ./cube-hardware-configuration.nix
-      ../modules/common.nix
+      ./common.nix
     ];
 
   # Bootloader.