diff --git a/homeassistant/components/backup/websocket.py b/homeassistant/components/backup/websocket.py
index 2fee84e39bb..718ffc3ae44 100644
--- a/homeassistant/components/backup/websocket.py
+++ b/homeassistant/components/backup/websocket.py
@@ -291,11 +291,15 @@ async def handle_config_info(
         vol.Required("type"): "backup/config/update",
         vol.Optional("create_backup"): vol.Schema(
             {
-                vol.Optional("agent_ids"): vol.All(list[str]),
-                vol.Optional("include_addons"): vol.Any(list[str], None),
+                vol.Optional("agent_ids"): vol.All([str], vol.Unique()),
+                vol.Optional("include_addons"): vol.Any(
+                    vol.All([str], vol.Unique()), None
+                ),
                 vol.Optional("include_all_addons"): bool,
                 vol.Optional("include_database"): bool,
-                vol.Optional("include_folders"): vol.Any([vol.Coerce(Folder)], None),
+                vol.Optional("include_folders"): vol.Any(
+                    vol.All([vol.Coerce(Folder)], vol.Unique()), None
+                ),
                 vol.Optional("name"): vol.Any(str, None),
                 vol.Optional("password"): vol.Any(str, None),
             },
diff --git a/tests/components/backup/snapshots/test_websocket.ambr b/tests/components/backup/snapshots/test_websocket.ambr
index 1607e2e15d9..dbad733d83a 100644
--- a/tests/components/backup/snapshots/test_websocket.ambr
+++ b/tests/components/backup/snapshots/test_websocket.ambr
@@ -1466,6 +1466,186 @@
     'type': 'result',
   })
 # ---
+# name: test_config_update_errors[command1]
+  dict({
+    'id': 1,
+    'result': dict({
+      'config': dict({
+        'create_backup': dict({
+          'agent_ids': list([
+          ]),
+          'include_addons': None,
+          'include_all_addons': False,
+          'include_database': True,
+          'include_folders': None,
+          'name': None,
+          'password': None,
+        }),
+        'last_attempted_automatic_backup': None,
+        'last_completed_automatic_backup': None,
+        'retention': dict({
+          'copies': None,
+          'days': None,
+        }),
+        'schedule': dict({
+          'state': 'never',
+        }),
+      }),
+    }),
+    'success': True,
+    'type': 'result',
+  })
+# ---
+# name: test_config_update_errors[command1].1
+  dict({
+    'id': 3,
+    'result': dict({
+      'config': dict({
+        'create_backup': dict({
+          'agent_ids': list([
+          ]),
+          'include_addons': None,
+          'include_all_addons': False,
+          'include_database': True,
+          'include_folders': None,
+          'name': None,
+          'password': None,
+        }),
+        'last_attempted_automatic_backup': None,
+        'last_completed_automatic_backup': None,
+        'retention': dict({
+          'copies': None,
+          'days': None,
+        }),
+        'schedule': dict({
+          'state': 'never',
+        }),
+      }),
+    }),
+    'success': True,
+    'type': 'result',
+  })
+# ---
+# name: test_config_update_errors[command2]
+  dict({
+    'id': 1,
+    'result': dict({
+      'config': dict({
+        'create_backup': dict({
+          'agent_ids': list([
+          ]),
+          'include_addons': None,
+          'include_all_addons': False,
+          'include_database': True,
+          'include_folders': None,
+          'name': None,
+          'password': None,
+        }),
+        'last_attempted_automatic_backup': None,
+        'last_completed_automatic_backup': None,
+        'retention': dict({
+          'copies': None,
+          'days': None,
+        }),
+        'schedule': dict({
+          'state': 'never',
+        }),
+      }),
+    }),
+    'success': True,
+    'type': 'result',
+  })
+# ---
+# name: test_config_update_errors[command2].1
+  dict({
+    'id': 3,
+    'result': dict({
+      'config': dict({
+        'create_backup': dict({
+          'agent_ids': list([
+          ]),
+          'include_addons': None,
+          'include_all_addons': False,
+          'include_database': True,
+          'include_folders': None,
+          'name': None,
+          'password': None,
+        }),
+        'last_attempted_automatic_backup': None,
+        'last_completed_automatic_backup': None,
+        'retention': dict({
+          'copies': None,
+          'days': None,
+        }),
+        'schedule': dict({
+          'state': 'never',
+        }),
+      }),
+    }),
+    'success': True,
+    'type': 'result',
+  })
+# ---
+# name: test_config_update_errors[command3]
+  dict({
+    'id': 1,
+    'result': dict({
+      'config': dict({
+        'create_backup': dict({
+          'agent_ids': list([
+          ]),
+          'include_addons': None,
+          'include_all_addons': False,
+          'include_database': True,
+          'include_folders': None,
+          'name': None,
+          'password': None,
+        }),
+        'last_attempted_automatic_backup': None,
+        'last_completed_automatic_backup': None,
+        'retention': dict({
+          'copies': None,
+          'days': None,
+        }),
+        'schedule': dict({
+          'state': 'never',
+        }),
+      }),
+    }),
+    'success': True,
+    'type': 'result',
+  })
+# ---
+# name: test_config_update_errors[command3].1
+  dict({
+    'id': 3,
+    'result': dict({
+      'config': dict({
+        'create_backup': dict({
+          'agent_ids': list([
+          ]),
+          'include_addons': None,
+          'include_all_addons': False,
+          'include_database': True,
+          'include_folders': None,
+          'name': None,
+          'password': None,
+        }),
+        'last_attempted_automatic_backup': None,
+        'last_completed_automatic_backup': None,
+        'retention': dict({
+          'copies': None,
+          'days': None,
+        }),
+        'schedule': dict({
+          'state': 'never',
+        }),
+      }),
+    }),
+    'success': True,
+    'type': 'result',
+  })
+# ---
 # name: test_delete[remote_agents0-backups0]
   dict({
     'id': 1,
diff --git a/tests/components/backup/test_websocket.py b/tests/components/backup/test_websocket.py
index a0860f49149..dfc118577b5 100644
--- a/tests/components/backup/test_websocket.py
+++ b/tests/components/backup/test_websocket.py
@@ -992,6 +992,18 @@ async def test_config_update(
             "create_backup": {"agent_ids": ["test-agent"]},
             "schedule": "someday",
         },
+        {
+            "type": "backup/config/update",
+            "create_backup": {"agent_ids": ["test-agent", "test-agent"]},
+        },
+        {
+            "type": "backup/config/update",
+            "create_backup": {"include_addons": ["my-addon", "my-addon"]},
+        },
+        {
+            "type": "backup/config/update",
+            "create_backup": {"include_folders": ["media", "media"]},
+        },
     ],
 )
 async def test_config_update_errors(