diff --git a/src/pylorax/base.py b/src/pylorax/base.py
index 38d31fd3..651c5b17 100644
--- a/src/pylorax/base.py
+++ b/src/pylorax/base.py
@@ -62,3 +62,6 @@ class DataHolder(dict):
 
     def __setattr__(self, attr, value):
         self[attr] = value
+
+    def copy(self):
+        return DataHolder(**dict.copy(self))