Added the rest of the configuration. Still some things to add.

modules/misc/default.nix

@@ -0,0 +1,10 @@
+{ ... }:
+
+{
+  imports = [
+    ./internationalisation.nix
+    ./power.nix
+    ./update.nix
+    ./users.nix
+  ];
+}

modules/misc/internationalisation.nix

@@ -0,0 +1,22 @@
+{ config, ... }:
+
+{
+  i18n.defaultLocale = "fr_FR.UTF-8";
+  i18n.extraLocaleSettings = {
+    LC_ADDRESS = "fr_FR.UTF-8";
+    LC_IDENTIFICATION = "fr_FR.UTF-8";
+    LC_MEASUREMENT = "fr_FR.UTF-8";
+    LC_MONETARY = "fr_FR.UTF-8";
+    LC_NAME = "fr_FR.UTF-8";
+    LC_NUMERIC = "fr_FR.UTF-8";
+    LC_PAPER = "fr_FR.UTF-8";
+    LC_TELEPHONE = "fr_FR.UTF-8";
+    LC_TIME = "fr_FR.UTF-8";
+  };
+
+  console.keyMap = "fr";
+  services.xserver.xkb = {
+    layout = "fr";
+    variant = "";
+  };
+}

modules/misc/power.nix

@@ -0,0 +1,28 @@
+{ config, lib, pkgs, ... }:
+
+let
+  hardDrives = config.numbus.hardware.dataDisksList ++ config.numbus.hardware.parityDisksList;
+in
+
+{
+  systemd.services.hd-idle = {
+    description = "External HD spin down daemon";
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart =
+        let
+          idleTime = toString 1800;
+          hardDriveParameter = lib.strings.concatMapStringsSep " " (x: "-a ${x} -i ${idleTime}") hardDrives;
+        in
+        "${pkgs.hd-idle}/bin/hd-idle -i 0 ${hardDriveParameter}";
+    };
+  };
+
+  services.autoaspm.enable = true;
+  powerManagement.powertop.enable = true;
+  boot.kernelParams = [
+    "pcie_aspm=force"
+    "consoleblank=60"
+  ];
+}

modules/misc/update.nix

@@ -0,0 +1,21 @@
+{ config, ... }:
+
+{
+  system.autoUpgrade = {
+    enable = true;
+    allowReboot = false;
+    flake = inputs.self.outPath;
+    flags = [ "--print-build-logs" ];
+    dates = "02:00";
+    randomizedDelaySec = "45min";
+  };
+
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 7d";
+  };
+
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  nix.settings.auto-optimise-store = true;
+}

modules/misc/users.nix

@@ -0,0 +1,16 @@
+{ config, ... }:
+
+{
+  users.users.numbus-admin = {
+    shell = pkgs.fish;
+    isNormalUser = true;
+    description = "Numbus Admin";
+    extraGroups = [ "wheel" ];
+    uid = 1000;
+    initialPassword = "changeMe!";
+    # required for auto start before user login
+    linger = true;
+    # required for rootless container with multiple users
+    autoSubUidGidRange = true;
+  };
+}