@@ -0,0 +1,24 @@+{ config, pkgs, ... }:
+
+{ nix = {
+    buildCores = 0;
+
+    daemonNiceLevel = 10;
+    daemonIONiceLevel = 4;
+
+    extraOptions = ''
+      auto-optimise-store = true;
+    '';
+    gc = {
+      automatic = true;
+      options = "--delete-older-than 30d";
+    };
+  };
+
+  system.autoUpgrade = {
+    enable = true;
+  };
+  systemd.services.nixos-upgrade.script = ''
+    ${config.system.build.nixos-rebuild}/bin/nixos-rebuild boot ${toString config.system.autoUpgrade.flags}
+  '';
+}

@@ -29,6 +29,7 @@ ./modules/satoshipay.nix     ./modules/accounting.nix
     ./modules/passwords.nix
     ./modules/network-manager.nix
+    ./modules/nix.nix
   ];
 
   boot.initrd.luks.devices = [
@@ -40,6 +41,9 @@ }   ];
 
   networking.hostName = "satoshipad";
+
+  nix.gc.dates = "12:00";
+  system.autoUpgrade.dates = "12:24";
 
   system.stateVersion = "17.03";
 }