diff --git a/modules/modules/services/vaultwarden-test.nix b/modules/modules/services/vaultwarden-test.nix
new file mode 100644
index 0000000..886b397
--- /dev/null
+++ b/modules/modules/services/vaultwarden-test.nix
@@ -0,0 +1,259 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.vaultwarden-test;
+  user = config.users.users.vaultwarden.name;
+  group = config.users.groups.vaultwarden.name;
+
+  # Convert name from camel case (e.g. disable2FARemember) to upper case snake case (e.g. DISABLE_2FA_REMEMBER).
+  nameToEnvVar = name:
+    let
+      parts = builtins.split "([A-Z0-9]+)" name;
+      partsToEnvVar = parts: foldl'
+        (key: x:
+          let last = stringLength key - 1; in
+          if isList x then key + optionalString (key != "" && substring last 1 key != "_") "_" + head x
+          else if key != "" && elem (substring 0 1 x) lowerChars then # to handle e.g. [ "disable" [ "2FAR" ] "emember" ]
+            substring 0 last key + optionalString (substring (last - 1) 1 key != "_") "_" + substring last 1 key + toUpper x
+          else key + toUpper x) ""
+        parts;
+    in
+    if builtins.match "[A-Z0-9_]+" name != null then name else partsToEnvVar parts;
+
+  # Due to the different naming schemes allowed for config keys,
+  # we can only check for values consistently after converting them to their corresponding environment variable name.
+  configEnv =
+    let
+      configEnv = concatMapAttrs
+        (name: value: optionalAttrs (value != null) {
+          ${nameToEnvVar name} = if isBool value then boolToString value else toString value;
+        })
+        cfg.config;
+    in
+    { DATA_FOLDER = cfg.dataDir; } // optionalAttrs (!(configEnv ? WEB_VAULT_ENABLED) || configEnv.WEB_VAULT_ENABLED == "true") {
+      WEB_VAULT_FOLDER = "${cfg.webVaultPackage}/share/vaultwarden/vault";
+    } // configEnv;
+
+  configFile = pkgs.writeText "vaultwarden.env" (concatStrings (mapAttrsToList (name: value: "${name}=${value}\n") configEnv));
+
+  vaultwarden = cfg.package.override { inherit (cfg) dbBackend; };
+
+in
+{
+  imports = [
+    # (mkRenamedOptionModule [ "services" "bitwarden_rs" ] [ "services" "vaultwarden" ])
+  ];
+
+  options.services.vaultwarden-test = with types; {
+    enable = mkEnableOption (lib.mdDoc "vaultwarden");
+
+    dbBackend = mkOption {
+      type = enum [ "sqlite" "mysql" "postgresql" ];
+      default = "sqlite";
+      description = lib.mdDoc ''
+        Which database backend vaultwarden will be using.
+      '';
+    };
+
+    dataDir = mkOption {
+      type = str;
+      default = "/var/lib/bitwarden_rs";
+      description = lib.mdDoc ''
+        The directory under which vaultwarden will keep its persistent data.
+      '';
+    };
+
+    backupDir = mkOption {
+      type = nullOr str;
+      default = null;
+      description = lib.mdDoc ''
+        The directory under which vaultwarden will backup its persistent data.
+      '';
+      example = "/var/backup/vaultwarden";
+    };
+
+    config = mkOption {
+      type = attrsOf (nullOr (oneOf [ bool int str ]));
+      default = {
+        ROCKET_ADDRESS = "::1"; # default to localhost
+        ROCKET_PORT = 8222;
+      };
+      example = literalExpression ''
+        {
+          DOMAIN = "https://bitwarden.example.com";
+          SIGNUPS_ALLOWED = false;
+
+          # Vaultwarden currently recommends running behind a reverse proxy
+          # (nginx or similar) for TLS termination, see
+          # https://github.com/dani-garcia/vaultwarden/wiki/Hardening-Guide#reverse-proxying
+          # > you should avoid enabling HTTPS via vaultwarden's built-in Rocket TLS support,
+          # > especially if your instance is publicly accessible.
+          #
+          # A suitable NixOS nginx reverse proxy example config might be:
+          #
+          #     services.nginx.virtualHosts."bitwarden.example.com" = {
+          #       enableACME = true;
+          #       forceSSL = true;
+          #       locations."/" = {
+          #         proxyPass = "http://127.0.0.1:''${toString config.services.vaultwarden.config.ROCKET_PORT}";
+          #       };
+          #     };
+          ROCKET_ADDRESS = "127.0.0.1";
+          ROCKET_PORT = 8222;
+
+          ROCKET_LOG = "critical";
+
+          # This example assumes a mailserver running on localhost,
+          # thus without transport encryption.
+          # If you use an external mail server, follow:
+          #   https://github.com/dani-garcia/vaultwarden/wiki/SMTP-configuration
+          SMTP_HOST = "127.0.0.1";
+          SMTP_PORT = 25;
+          SMTP_SSL = false;
+
+          SMTP_FROM = "admin@bitwarden.example.com";
+          SMTP_FROM_NAME = "example.com Bitwarden server";
+        }
+      '';
+      description = lib.mdDoc ''
+        The configuration of vaultwarden is done through environment variables,
+        therefore it is recommended to use upper snake case (e.g. {env}`DISABLE_2FA_REMEMBER`).
+
+        However, camel case (e.g. `disable2FARemember`) is also supported:
+        The NixOS module will convert it automatically to
+        upper case snake case (e.g. {env}`DISABLE_2FA_REMEMBER`).
+        In this conversion digits (0-9) are handled just like upper case characters,
+        so `foo2` would be converted to {env}`FOO_2`.
+        Names already in this format remain unchanged, so `FOO2` remains `FOO2` if passed as such,
+        even though `foo2` would have been converted to {env}`FOO_2`.
+        This allows working around any potential future conflicting naming conventions.
+
+        Based on the attributes passed to this config option an environment file will be generated
+        that is passed to vaultwarden's systemd service.
+
+        The available configuration options can be found in
+        [the environment template file](https://github.com/dani-garcia/vaultwarden/blob/${vaultwarden.version}/.env.template).
+
+        See [](#opt-services.vaultwarden.environmentFile) for how
+        to set up access to the Admin UI to invite initial users.
+      '';
+    };
+
+    environmentFile = mkOption {
+      type = with types; nullOr path;
+      default = null;
+      example = "/var/lib/vaultwarden.env";
+      description = lib.mdDoc ''
+        Additional environment file as defined in {manpage}`systemd.exec(5)`.
+
+        Secrets like {env}`ADMIN_TOKEN` and {env}`SMTP_PASSWORD`
+        may be passed to the service without adding them to the world-readable Nix store.
+
+        Note that this file needs to be available on the host on which
+        `vaultwarden` is running.
+
+        As a concrete example, to make the Admin UI available
+        (from which new users can be invited initially),
+        the secret {env}`ADMIN_TOKEN` needs to be defined as described
+        [here](https://github.com/dani-garcia/vaultwarden/wiki/Enabling-admin-page).
+        Setting `environmentFile` to `/var/lib/vaultwarden.env`
+        and ensuring permissions with e.g.
+        `chown vaultwarden:vaultwarden /var/lib/vaultwarden.env`
+        (the `vaultwarden` user will only exist after activating with
+        `enable = true;` before this), we can set the contents of the file to have
+        contents such as:
+
+        ```
+        # Admin secret token, see
+        # https://github.com/dani-garcia/vaultwarden/wiki/Enabling-admin-page
+        ADMIN_TOKEN=...copy-paste a unique generated secret token here...
+        ```
+      '';
+    };
+
+    package = mkPackageOption pkgs "vaultwarden" { };
+
+    webVaultPackage = mkOption {
+      type = package;
+      default = pkgs.vaultwarden.webvault;
+      defaultText = literalExpression "pkgs.vaultwarden.webvault";
+      description = lib.mdDoc "Web vault package to use.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    assertions = [{
+      assertion = cfg.backupDir != null -> cfg.dbBackend == "sqlite";
+      message = "Backups for database backends other than sqlite will need customization";
+    }];
+
+    users.users.vaultwarden = {
+      inherit group;
+      isSystemUser = true;
+    };
+    users.groups.vaultwarden = { };
+
+    systemd.services.vaultwarden = {
+      aliases = [ "bitwarden_rs.service" ];
+      after = [ "network.target" ];
+      path = with pkgs; [ openssl ];
+      serviceConfig = {
+        User = user;
+        Group = group;
+        EnvironmentFile = [ configFile ] ++ optional (cfg.environmentFile != null) cfg.environmentFile;
+        ExecStart = "${vaultwarden}/bin/vaultwarden";
+        LimitNOFILE = "1048576";
+        PrivateTmp = "true";
+        PrivateDevices = "true";
+        ProtectHome = "true";
+        ProtectSystem = "strict";
+        AmbientCapabilities = "CAP_NET_BIND_SERVICE";
+        ReadWritePaths = "${cfg.dataDir}";
+        Restart = "always";
+      };
+      wantedBy = [ "multi-user.target" ];
+    };
+
+    systemd.tmpfiles.settings."10-vaultwarden" = {
+      ${cfg.dataDir}.d = { inherit user group; mode = "0700"; };
+    } // optionalAttrs (cfg.backupDir != null) {
+      ${cfg.backupDir}.d = { inherit user group; mode = "0770"; };
+    };
+
+    systemd.services.backup-vaultwarden = mkIf (cfg.backupDir != null) {
+      aliases = [ "backup-bitwarden_rs.service" ];
+      description = "Backup vaultwarden";
+      environment = {
+        DATA_FOLDER = cfg.dataDir;
+        BACKUP_FOLDER = cfg.backupDir;
+      };
+      path = with pkgs; [ sqlite ];
+      # if both services are started at the same time, vaultwarden fails with "database is locked"
+      before = [ "vaultwarden.service" ];
+      serviceConfig = {
+        SyslogIdentifier = "backup-vaultwarden";
+        Type = "oneshot";
+        User = mkDefault user;
+        Group = mkDefault group;
+        ExecStart = "${pkgs.bash}/bin/bash ${./backup.sh}";
+      };
+      wantedBy = [ "multi-user.target" ];
+    };
+
+    systemd.timers.backup-vaultwarden = mkIf (cfg.backupDir != null) {
+      aliases = [ "backup-bitwarden_rs.timer" ];
+      description = "Backup vaultwarden on time";
+      timerConfig = {
+        OnCalendar = mkDefault "23:00";
+        Persistent = "true";
+        Unit = "backup-vaultwarden.service";
+      };
+      wantedBy = [ "multi-user.target" ];
+    };
+  };
+
+  # uses attributes of the linked package
+  meta.buildDocsInSandbox = false;
+}