diff --git a/supervisor/backups/backup.py b/supervisor/backups/backup.py
index 334bd6906bd..9390919bb9a 100644
--- a/supervisor/backups/backup.py
+++ b/supervisor/backups/backup.py
@@ -162,12 +162,12 @@ def folders(self) -> list[str]:
 
     @property
     def repositories(self) -> list[str]:
-        """Return backup date."""
+        """Return add-on store repositories."""
         return self._data[ATTR_REPOSITORIES]
 
     @repositories.setter
     def repositories(self, value: list[str]) -> None:
-        """Set backup date."""
+        """Set add-on store repositories."""
         self._data[ATTR_REPOSITORIES] = value
 
     @property
@@ -286,7 +286,7 @@ def __eq__(self, other: Any) -> bool:
                 or k not in other._data
                 or self._data[k] != other._data[k]
             ):
-                _LOGGER.debug(
+                _LOGGER.info(
                     "Backup %s and %s not equal because %s field has different value: %s and %s",
                     self.slug,
                     other.slug,
diff --git a/supervisor/store/validate.py b/supervisor/store/validate.py
index e21982ead5b..7582b982726 100644
--- a/supervisor/store/validate.py
+++ b/supervisor/store/validate.py
@@ -28,6 +28,15 @@
 )
 
 
+def ensure_builtin_repositories(addon_repositories: list[str]) -> list[str]:
+    """Ensure builtin repositories are in list.
+
+    Note: This should not be used in validation as the resulting list is not
+    stable. This can have side effects when comparing data later on.
+    """
+    return list(set(addon_repositories) | BUILTIN_REPOSITORIES)
+
+
 def validate_repository(repository: str) -> str:
     """Validate a valid repository."""
     if repository in [StoreType.CORE, StoreType.LOCAL]:
@@ -44,13 +53,7 @@ def validate_repository(repository: str) -> str:
     return repository
 
 
-def ensure_builtin_repositories(addon_repositories: list[str]) -> list[str]:
-    """Ensure builtin repositories are in list."""
-    return list(set(addon_repositories) | BUILTIN_REPOSITORIES)
-
-
-# pylint: disable=no-value-for-parameter
-repositories = vol.All([validate_repository], vol.Unique(), ensure_builtin_repositories)
+repositories = vol.All([validate_repository], vol.Unique())
 
 SCHEMA_STORE_FILE = vol.Schema(
     {