diff --git a/homeassistant/components/cloud/backup.py b/homeassistant/components/cloud/backup.py
index 43c87da39a3..0f137553d34 100644
--- a/homeassistant/components/cloud/backup.py
+++ b/homeassistant/components/cloud/backup.py
@@ -114,7 +114,11 @@ class CloudBackupAgent(BackupAgent):
             raise BackupAgentError("Failed to get download details") from err
 
         try:
-            resp = await self._cloud.websession.get(details["url"])
+            resp = await self._cloud.websession.get(
+                details["url"],
+                timeout=ClientTimeout(connect=10.0, total=43200.0),  # 43200s == 12h
+            )
+
             resp.raise_for_status()
         except ClientError as err:
             raise BackupAgentError("Failed to download backup") from err