diff --git a/README.md b/README.md
index 4e8764f2..3d9a7f35 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,10 @@ Currently supported services and features are:
 - [ ] Gitea to deploy
 - [ ] Scrutiny to monitor hard drives health
   - [ ] Export metrics to Prometheus.
+- [x] Tests
+  - [x] Unit tests for modules.
+  - [x] Running in CI.
+  - [ ] Integration tests with real nodes.
 
 ## Usage
 
diff --git a/modules/arr.nix b/modules/arr.nix
index dd497827..105d21c6 100644
--- a/modules/arr.nix
+++ b/modules/arr.nix
@@ -319,14 +319,16 @@ config.xml" templatedSettings) "${config.services.radarr.dataDir}/config.xml" (
 
       shb.backup.instances =
         let
-          backupConfig = name: _defaults: lib.mkIf (cfg.${name}.backupCfg != {}) {
-            ${name} = {
-              sourceDirectories = [
-                config.shb.arr.${name}.dataDir
-              ];
-              excludePatterns = [".db-shm" ".db-wal" ".mono"];
-            };
-          };
+          backupConfig = name: _defaults: lib.mkIf (cfg.${name}.backupCfg.enable or false) ({
+            ${name} = (
+              cfg.${name}.backupCfg
+              // {
+                sourceDirectories = [
+                  config.shb.arr.${name}.dataDir
+                ];
+                excludePatterns = [".db-shm" ".db-wal" ".mono"];
+              });
+          });
         in
           lib.mkMerge (lib.mapAttrsToList backupConfig apps);
     }
diff --git a/test/modules/arr.nix b/test/modules/arr.nix
index 939b82de..972f2dcb 100644
--- a/test/modules/arr.nix
+++ b/test/modules/arr.nix
@@ -50,4 +50,149 @@ in
     };
     expr = testConfig {};
   };
+
+  testRadarr = {
+    expected = {
+      systemd.services.radarr = {
+        preStart = "ln -fs /nix/store/z7gk6xfj51sr1n1bjj6lsadjrwjxzc5d--config.xml /var/lib/radarr/config.xml.template\nrm /var/lib/radarr/config.xml || :\nsed -e \"s|%APIKEY%|$(cat /run/radarr/apikey)|\" /var/lib/radarr/config.xml.template > /var/lib/radarr/config.xml\n";
+        serviceConfig = {
+          StateDirectoryMode = "0750";
+          UMask = "0027";
+        };
+      };
+      systemd.services.jackett = {};
+      systemd.tmpfiles.rules = [
+        "d '/var/lib/radarr' 0750 radarr radarr - -"
+      ];
+      shb.backup = {};
+      shb.nginx.autheliaProtect = [
+        {
+          autheliaRules = [
+            {
+              domain = "radarr.example.com";
+              policy = "bypass";
+              resources = [
+                "^/api.*"
+              ];
+            }
+            {
+              domain = "radarr.example.com";
+              policy = "two_factor";
+              subject = [
+                "group:arr_user"
+              ];
+            }
+          ];
+          domain = "example.com";
+          oidcEndpoint = "https://oidc.example.com";
+          subdomain = "radarr";
+          upstream = "http://127.0.0.1:7001";
+        }
+      ];
+      users.users.radarr.extraGroups = [ "media" ];
+      users.groups.radarr.members = [ "backup" ];
+      services.bazarr = {};
+      services.jackett = {};
+      services.lidarr = {};
+      services.radarr = {
+        enable = true;
+        dataDir = "/var/lib/radarr";
+        user = "radarr";
+        group = "radarr";
+      };
+      services.readarr = {};
+      services.sonarr = {};
+    };
+    expr = testConfig {
+      services.radarr.user = "radarr";
+      services.radarr.group = "radarr";
+
+      shb.arr.radarr = {
+        subdomain = "radarr";
+        domain = "example.com";
+        enable = true;
+        oidcEndpoint = "https://oidc.example.com";
+        settings = {
+          APIKeyFile = "/run/radarr/apikey";
+        };
+      };
+    };
+  };
+
+  testRadarrWithBackup = {
+    expected = {
+      systemd.services.radarr = {
+        preStart = "ln -fs /nix/store/z7gk6xfj51sr1n1bjj6lsadjrwjxzc5d--config.xml /var/lib/radarr/config.xml.template\nrm /var/lib/radarr/config.xml || :\nsed -e \"s|%APIKEY%|$(cat /run/radarr/apikey)|\" /var/lib/radarr/config.xml.template > /var/lib/radarr/config.xml\n";
+        serviceConfig = {
+          StateDirectoryMode = "0750";
+          UMask = "0027";
+        };
+      };
+      systemd.services.jackett = {};
+      systemd.tmpfiles.rules = [
+        "d '/var/lib/radarr' 0750 radarr radarr - -"
+      ];
+      shb.backup.instances = {
+        radarr = {
+          enable = true;
+          sourceDirectories = [ "/var/lib/radarr" ];
+          excludePatterns = [ ".db-shm" ".db-wal" ".mono" ];
+        };
+      };
+      shb.nginx.autheliaProtect = [
+        {
+          autheliaRules = [
+            {
+              domain = "radarr.example.com";
+              policy = "bypass";
+              resources = [
+                "^/api.*"
+              ];
+            }
+            {
+              domain = "radarr.example.com";
+              policy = "two_factor";
+              subject = [
+                "group:arr_user"
+              ];
+            }
+          ];
+          domain = "example.com";
+          oidcEndpoint = "https://oidc.example.com";
+          subdomain = "radarr";
+          upstream = "http://127.0.0.1:7001";
+        }
+      ];
+      users.users.radarr.extraGroups = [ "media" ];
+      users.groups.radarr.members = [ "backup" ];
+      services.bazarr = {};
+      services.jackett = {};
+      services.lidarr = {};
+      services.radarr = {
+        enable = true;
+        dataDir = "/var/lib/radarr";
+        user = "radarr";
+        group = "radarr";
+      };
+      services.readarr = {};
+      services.sonarr = {};
+    };
+    expr = testConfig {
+      services.radarr.user = "radarr";
+      services.radarr.group = "radarr";
+
+      shb.arr.radarr = {
+        subdomain = "radarr";
+        domain = "example.com";
+        enable = true;
+        oidcEndpoint = "https://oidc.example.com";
+        settings = {
+          APIKeyFile = "/run/radarr/apikey";
+        };
+        backupCfg = {
+          enable = true;
+        };
+      };
+    };
+  };
 }