diff --git a/tiramisu/api.py b/tiramisu/api.py
index 355111c..7caba99 100644
--- a/tiramisu/api.py
+++ b/tiramisu/api.py
@@ -16,7 +16,6 @@
 # ____________________________________________________________
 from inspect import ismethod, getdoc, signature
 from time import time
-from copy import deepcopy
 from typing import List, Any, Optional, Callable, Union, Dict
 
 
@@ -979,12 +978,16 @@ class TiramisuContextConfig(TiramisuContext):
         return self.config_bag.context.impl_getname()
 
     def _c_copy(self,
-                  session_id=None):
-        return Config(self.config_bag.context.duplicate(session_id))
+                  session_id=None,
+                  storage=None):
+        return Config(self.config_bag.context.duplicate(session_id,
+                                                        storage=storage))
 
     def _c_deepcopy(self,
-                  session_id=None):
+                  session_id=None,
+                  storage=None):
         return Config(self.config_bag.context.duplicate(session_id,
+                                                        storage=storage,
                                                         deep=True))
 
     def _c_meta(self):
@@ -1146,7 +1149,7 @@ class GroupConfig(TiramisuAPI):
         super().__init__(config)
 
 
-def getapi(config: Config):
+def getapi(config: Config):  # pragma: no cover
     """instanciate Config
 
     :param config: KernelConfig object