diff --git a/hosts/yodaNas/configuration.nix b/hosts/yodaNas/configuration.nix
index 46ccc0d..60f83e0 100644
--- a/hosts/yodaNas/configuration.nix
+++ b/hosts/yodaNas/configuration.nix
@@ -22,8 +22,7 @@ in
       ../../modules/home-manager.nix
       # NUR.
       ../../modules/nur.nix
-      # Device specific.
-      #../../modules/yodaNas.nix
+      ./host-specific.nix
 
       ../../modules/base.nix
       ../../modules/base-headless.nix
@@ -66,10 +65,4 @@ in
   boot.kernelParams = [];
 
   boot.kernelPackages = pkgs.linuxPackages;
-
-  # TODO: For "/" this cfg resides in base.nix
-  fileSystems = {
-    "/mnt/data".options   = [ "compress=zstd" "noatime" "commit=120" ];
-    "/mnt/backup".options = [ "compress=zstd" "noatime" "commit=120" ];
-  };
 }
diff --git a/hosts/yodaNas/host-specific.nix b/hosts/yodaNas/host-specific.nix
new file mode 100644
index 0000000..356aca7
--- /dev/null
+++ b/hosts/yodaNas/host-specific.nix
@@ -0,0 +1,98 @@
+{ config, pkgs, ... }:
+let
+  my-python-packages = ps: with ps; [
+    # netcup-dns is not (yet) packaged, thus we build it from PyPI
+    (
+      buildPythonPackage rec {
+        pname = "netcup-dns";
+        version = "0.2.0";
+        # https://nixos.wiki/wiki/Packaging/Python#Fix_Missing_setup.py
+        format = "pyproject";
+        src = fetchPypi {
+          inherit pname version;
+          sha256 = "sha256-tZKPe02tHrTelyw30BQsJhdZpmDsggZ0rr4ag0eHtng=";
+        };
+        propagatedBuildInputs = [
+          # Dependencies
+          pkgs.python3Packages.requests
+          pkgs.python3Packages.nc-dnsapi
+          # Build dependencies
+          build
+          twine
+        ];
+      }
+    )
+  ];
+in
+{
+  # TODO: For "/" this cfg resides in base.nix
+  fileSystems = {
+    "/mnt/data".options   = [ "compress=zstd" "noatime" "commit=120" ];
+    "/mnt/backup".options = [ "compress=zstd" "noatime" "commit=120" ];
+  };
+
+  # Install netcup-dns.
+  environment.systemPackages = [
+    (pkgs.python3.withPackages my-python-packages)
+  ];
+  # Configure netcup-dns.
+  # Create file `/etc/netcup-dns/netcup-dns-95191.json`.
+  deployment.keys."netcup-dns-95191.json" = {
+    keyFile = ../../secrets/netcup-dns.json;
+    destDir = "/etc/netcup-dns";
+    user = "netcup-dns";
+    group = "netcup-dns";
+  };
+  # Create netcup-dns daemon user.
+  users.users.netcup-dns = {
+    isSystemUser = true;
+    group = "netcup-dns";
+    description = "netcup-dns daemon";
+  };
+  users.groups.netcup-dns = {};
+  # Create netcup-dns timer.
+  systemd.timers."netcup-dns" = {
+    wantedBy = [ "timers.target" ];
+    partOf = [ "netcup-dns.service" ];
+    # https://man.archlinux.org/man/systemd.timer.5
+    timerConfig = {
+      OnCalendar = "3m";
+      AccuracySec = "15s";
+      RandomizedDelaySec = "15s";
+      Persistent = true;
+    };
+  };
+  systemd.services."netcup-dns" = {
+    serviceConfig = {
+      Type = "oneshot";
+      PrivateTmp = true;
+      User = "netcup-dns";
+      Nice = 19;
+      IOSchedulingClass = "idle";
+      #ExecStart = "/run/current-system/sw/bin/netcup-dns";
+      #ExecStart = "${my-python-packages}/bin/netcup-dns";
+      ExecStart = "${pkgs.python3.withPackages my-python-packages}/bin/netcup-dns";
+    };
+#    path = with pkgs; [
+#      my-python-packages
+#    ];
+  };
+
+  # Start Jinja-Compose project during boot.
+  # To few the log, run
+  #   journalctl -b -u Jinja-Compose -f
+  #
+  systemd.services."Jinja-Compose" = {
+    description = "Start Jinja-Compose project";
+    path = with pkgs; [
+      # The `docker-compose` helper script is written in `bash` (!)
+      bash
+      docker
+    ];
+    script = ''
+      /mnt/data/docker-compose/docker-compose up -d --wait
+    '';
+    # Start after login.
+    wantedBy = [ "multi-user.target" ];
+  };
+}
diff --git a/hosts/yodaYoga/configuration.nix b/hosts/yodaYoga/configuration.nix
index b33e4f0..abd05b4 100644
--- a/hosts/yodaYoga/configuration.nix
+++ b/hosts/yodaYoga/configuration.nix
@@ -22,8 +22,7 @@ in
       ../../modules/home-manager.nix
       # NUR.
       ../../modules/nur.nix
-      # Device specific.
-      ../../modules/yodaYoga.nix
+      ./host-specific.nix
 
       ../../modules/base.nix
       ../../modules/base-headless.nix
diff --git a/modules/yodaYoga.nix b/hosts/yodaYoga/host-specific.nix
similarity index 100%
rename from modules/yodaYoga.nix
rename to hosts/yodaYoga/host-specific.nix