diff --git a/radicale/storage.py b/radicale/storage.py
index cf50bc9e..e3b6f1df 100644
--- a/radicale/storage.py
+++ b/radicale/storage.py
@@ -726,7 +726,7 @@ class Collection(BaseCollection):
                         href = self._find_available_file_name(
                             vobject_items.get, suffix=".ics")
                         vobject_items[href] = new_collection
-                    self.upload_all_nonatomic(vobject_items)
+                    self._upload_all_nonatomic(vobject_items)
                 elif props.get("tag") == "VCARD":
                     vobject_items = {}
                     for card in collection:
@@ -735,7 +735,7 @@ class Collection(BaseCollection):
                         href = self._find_available_file_name(
                             vobject_items.get, suffix=".vcf")
                         vobject_items[href] = card
-                    self.upload_all_nonatomic(vobject_items)
+                    self._upload_all_nonatomic(vobject_items)
 
             # This operation is not atomic on the filesystem level but it's
             # very unlikely that one rename operations succeeds while the
@@ -748,6 +748,10 @@ class Collection(BaseCollection):
         return cls(sane_path, principal=principal)
 
     def upload_all_nonatomic(self, vobject_items):
+        """DEPRECATED: Use ``_upload_all_nonatomic``"""
+        return self._upload_all_nonatomic(vobject_items)
+
+    def _upload_all_nonatomic(self, vobject_items):
         """Upload a new set of items.
 
         This takes a mapping of href and vobject items and