diff --git a/.strict-typing b/.strict-typing
index b1f6db6a532..652d5fe29e1 100644
--- a/.strict-typing
+++ b/.strict-typing
@@ -45,6 +45,7 @@ homeassistant.components.amcrest.*
 homeassistant.components.ampio.*
 homeassistant.components.aseko_pool_live.*
 homeassistant.components.automation.*
+homeassistant.components.backup.*
 homeassistant.components.binary_sensor.*
 homeassistant.components.bluetooth_tracker.*
 homeassistant.components.bmw_connected_drive.*
diff --git a/homeassistant/components/backup/websocket.py b/homeassistant/components/backup/websocket.py
index 2f1381ce217..5e2d5a99d31 100644
--- a/homeassistant/components/backup/websocket.py
+++ b/homeassistant/components/backup/websocket.py
@@ -23,7 +23,7 @@ async def handle_info(
     hass: HomeAssistant,
     connection: websocket_api.ActiveConnection,
     msg: dict,
-):
+) -> None:
     """List all stored backups."""
     manager: BackupManager = hass.data[DOMAIN]
     backups = await manager.get_backups()
@@ -48,7 +48,7 @@ async def handle_remove(
     hass: HomeAssistant,
     connection: websocket_api.ActiveConnection,
     msg: dict,
-):
+) -> None:
     """Remove a backup."""
     manager: BackupManager = hass.data[DOMAIN]
     await manager.remove_backup(msg["slug"])
@@ -62,7 +62,7 @@ async def handle_create(
     hass: HomeAssistant,
     connection: websocket_api.ActiveConnection,
     msg: dict,
-):
+) -> None:
     """Generate a backup."""
     manager: BackupManager = hass.data[DOMAIN]
     backup = await manager.generate_backup()
diff --git a/mypy.ini b/mypy.ini
index 63c1419d175..2d4005afae6 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -296,6 +296,17 @@ no_implicit_optional = true
 warn_return_any = true
 warn_unreachable = true
 
+[mypy-homeassistant.components.backup.*]
+check_untyped_defs = true
+disallow_incomplete_defs = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_untyped_decorators = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+warn_return_any = true
+warn_unreachable = true
+
 [mypy-homeassistant.components.binary_sensor.*]
 check_untyped_defs = true
 disallow_incomplete_defs = true