diff --git a/.dotter/global.toml b/.dotter/global.toml
index 8749da7..4666d24 100644
--- a/.dotter/global.toml
+++ b/.dotter/global.toml
@@ -58,3 +58,4 @@ xmonad = "~/.xmonad"
 
 [nix.files]
 "direnvrc" = "~/.config/direnv/direnvrc"
+"nix/configuration.nix" = "/etc/nixos/configuration.nix"
diff --git a/i3/i3/config b/i3/i3/config
index 11f14cd..8d7061e 100644
--- a/i3/i3/config
+++ b/i3/i3/config
@@ -282,7 +282,7 @@ exec firefox
 exec --no-startup-id nm-applet
 exec --no-startup-id blueman-applet
 exec --no-startup-id xfce4-power-manager
-exec --no-startup-id nextcloud
+exec --no-startup-id nextcloud --background
 # exec --no-startup-id xfce4-screensaver
 
 # Authentication agent
diff --git a/nix/configuration.nix b/nix/configuration.nix
new file mode 100644
index 0000000..95e1410
--- /dev/null
+++ b/nix/configuration.nix
@@ -0,0 +1,256 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, ... }:
+
+{
+  imports = [ # Include the results of the hardware scan.
+    /etc/nixos/hardware-configuration.nix
+  ];
+
+  # Bootloader.
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+  boot.loader.efi.efiSysMountPoint = "/boot/efi";
+
+  boot.supportedFilesystems = [ "btrfs" "ntfs" "nfs" "cifs" ];
+
+  networking.hostName = "nixos"; # Define your hostname.
+  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+
+  # Configure network proxy if necessary
+  # networking.proxy.default = "http://user:password@proxy:port/";
+  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
+
+  # Enable networking
+  networking.networkmanager.enable = true;
+
+  # Set your time zone.
+  time.timeZone = "Europe/Berlin";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+
+  i18n.extraLocaleSettings = {
+    LC_ADDRESS = "de_DE.UTF-8";
+    LC_IDENTIFICATION = "de_DE.UTF-8";
+    LC_MEASUREMENT = "de_DE.UTF-8";
+    LC_MONETARY = "de_DE.UTF-8";
+    LC_NAME = "de_DE.UTF-8";
+    LC_NUMERIC = "de_DE.UTF-8";
+    LC_PAPER = "de_DE.UTF-8";
+    LC_TELEPHONE = "de_DE.UTF-8";
+    LC_TIME = "de_DE.UTF-8";
+  };
+
+  nix.settings.auto-optimise-store = true;
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # Enable the X11 windowing system.
+  services.xserver.enable = true;
+  services.xserver.videoDrivers = [ "nvidia" ];
+  hardware.nvidia.package =
+    config.boot.kernelPackages.nvidiaPackages.legacy_470;
+  hardware.opengl.enable = true;
+  # hardware.nvidia.modesetting.enable = true; # for wayland
+
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
+  # Enable the XFCE Desktop Environment.
+  services.xserver.displayManager.lightdm.enable = true;
+  services.xserver.desktopManager = {
+    xterm.enable = false;
+    xfce = {
+      enable = true;
+      noDesktop = true;
+      enableXfwm = false;
+    };
+  };
+  services.xserver.displayManager.defaultSession = "xfce+i3";
+  services.xserver.windowManager.i3.enable = true;
+  services.xserver.windowManager.i3.package = pkgs.i3-gaps;
+  services.xserver.windowManager.i3.extraPackages = with pkgs; [
+    rofi
+    i3lock
+    # i3scrot
+    i3status-rust
+    nitrogen
+    dunst
+  ];
+
+  # Configure keymap in X11
+  services.xserver = {
+    layout = "de";
+    xkbVariant = "";
+  };
+
+  # Configure console keymap
+  console.keyMap = "de";
+
+  # Enable CUPS to print documents.
+  services.printing.enable = true;
+
+  # Enable sound with pipewire.
+  sound.enable = true;
+  hardware.pulseaudio.enable = false;
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    # If you want to use JACK applications, uncomment this
+    #jack.enable = true;
+
+    # use the example session manager (no others are packaged yet so this is enabled by default,
+    # no need to redefine it in your config for now)
+    #media-session.enable = true;
+  };
+
+  # Enable touchpad support (enabled default in most desktopManager).
+  # services.xserver.libinput.enable = true;
+
+  # Define a user account. Don't forget to set a password with ‘passwd’.
+  users.users.julian = {
+    isNormalUser = true;
+    description = "Julian";
+    uid = 1000;
+    group = "julian";
+    shell = pkgs.zsh;
+    extraGroups = [ "networkmanager" "wheel" ];
+    packages = with pkgs; [
+      firefox
+      thunderbird
+      nextcloud-client
+      qalculate-gtk
+      schildichat-desktop
+      tdesktop
+      hunspell
+      hunspellDicts.de_DE
+      hunspellDicts.en_US
+    ];
+  };
+
+  users.groups.julian = { gid = 1000; };
+
+  # Allow unfree packages
+  nixpkgs.config.allowUnfree = true;
+  #  nixpkgs.config.packageOverrides = pkgs: {
+  #    emacs = pkgs.lib.overrideDerivation (pkgs.emacs.override {
+  #        # Use gtk2
+  #        withGTK2 = true;
+  #        withGTK3 = false;
+  #    });
+  #  };
+
+  environment.etc."manual-links/xfce4-notifyd".source =
+    "${pkgs.xfce.xfce4-notifyd}/lib/xfce4/notifyd/xfce4-notifyd";
+  environment.etc."manual-links/polkit-gnome-authentication-agent-1".source =
+    "${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1";
+  environment.pathsToLink = [ "/share/nix-direnv" ];
+  environment.shells = with pkgs; [ zsh ]; # adds zsh to /etc/shells
+
+  # List packages installed in system profile. To search, run:
+  # $ nix search wget
+  environment.systemPackages = with pkgs; [
+    gcolor2 # gcolor3 does not work
+    vim
+    neovim
+    wget
+    gparted
+    emacs
+    git
+    dotter
+    mc
+    tree
+    alacritty
+    starship
+    zsh
+    bat
+    ripgrep
+    fd
+    fzf
+    topgrade
+    cargo
+    arandr
+    wireguard-tools
+    htop
+    texlive.combined.scheme-medium
+    usbutils # lsusb
+    pciutils # lspci
+    nixfmt
+    gnome.gnome-keyring
+    polkit_gnome
+    nix-index
+    python3
+    libnotify
+    killall
+    unzip
+    vlc
+    direnv
+    nix-direnv
+    handbrake
+  ];
+
+  nixpkgs.overlays = [
+    (self: super: {
+      nix-direnv = super.nix-direnv.override { enableFlakes = true; };
+      # nextcloud-client = super.nextcloud-client.overrideAttrs (old: {
+      #   version = "3.7.4";
+      #   src = super.fetchFromGitHub {
+      #     owner = "nextcloud";
+      #     repo = "desktop";
+      #     rev = "v3.7.4";
+      #     sha256 = "sha256-K9P9avZdW+QR+K+GSp4kqWVZX5J7mHpu4gyuR4smmcU=";
+      #   };
+      #   patches = [ ];
+      # });
+    })
+  ];
+
+  fonts.fonts = with pkgs; [
+    (nerdfonts.override { fonts = [ "FiraCode" ]; })
+    font-awesome
+    dejavu_fonts
+    noto-fonts
+    noto-fonts-cjk
+    noto-fonts-emoji
+    liberation_ttf
+    fira-code
+    fira-code-symbols
+    source-code-pro
+  ];
+
+  # Some programs need SUID wrappers, can be configured further or are
+  # started in user sessions.
+  # programs.mtr.enable = true;
+  # programs.gnupg.agent = {
+  #   enable = true;
+  #   enableSSHSupport = true;
+  # };
+
+  # List services that you want to enable:
+
+  # Enable the OpenSSH daemon.
+  # services.openssh.enable = true;
+
+  # Open ports in the firewall.
+  # networking.firewall.allowedTCPPorts = [ ... ];
+  # networking.firewall.allowedUDPPorts = [ ... ];
+  # Or disable the firewall altogether.
+  # networking.firewall.enable = false;
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "22.11"; # Did you read the comment?
+
+}