diff --git a/pypika/dialects.py b/pypika/dialects.py
index cfbb6be4..30d41db8 100644
--- a/pypika/dialects.py
+++ b/pypika/dialects.py
@@ -1,3 +1,5 @@
+from copy import copy
+
 from pypika.enums import Dialects
 from pypika.queries import (
     Query,
@@ -21,6 +23,11 @@ def __init__(self):
         super(MySQLQueryBuilder, self).__init__(quote_char='`', dialect=Dialects.MYSQL, wrap_union_queries=False)
         self._duplicate_updates = []
 
+    def __copy__(self):
+        newone = super(MySQLQueryBuilder, self).__copy__()
+        newone._duplicate_updates = copy(self._duplicate_updates)
+        return newone
+
     @builder
     def on_duplicate_key_update(self, field, value):
         field = Field(field) if not isinstance(field, Field) else field
@@ -101,6 +108,12 @@ def __init__(self):
         self._on_conflict_do_nothing = False
         self._on_conflict_updates = []
 
+    def __copy__(self):
+        newone = super(PostgreQueryBuilder, self).__copy__()
+        newone._returns = copy(self._returns)
+        newone._on_conflict_updates = copy(self._on_conflict_updates)
+        return newone
+
     @builder
     def on_conflict(self, target_field):
         if not self._insert_table:
diff --git a/pypika/queries.py b/pypika/queries.py
index 4c7c1c42..9e7ca45c 100644
--- a/pypika/queries.py
+++ b/pypika/queries.py
@@ -1,3 +1,4 @@
+from copy import copy
 from functools import reduce
 
 from .enums import (
@@ -396,11 +397,19 @@ def __init__(self, quote_char='"', dialect=None, wrap_union_queries=True, wrappe
         self._wrapper_cls = wrapper_cls
 
     def __copy__(self):
-        newone = type(self)()
+        newone = type(self).__new__(type(self))
         newone.__dict__.update(self.__dict__)
-        for key, value in self.__dict__.items():
-            if isinstance(value, (set, list)):
-                newone.__dict__[key] = type(value)(x for x in value)
+        newone._select_star_tables = copy(self._select_star_tables)
+        newone._from = copy(self._from)
+        newone._with = copy(self._with)
+        newone._selects = copy(self._selects)
+        newone._columns = copy(self._columns)
+        newone._values = copy(self._values)
+        newone._groupbys = copy(self._groupbys)
+        newone._orderbys = copy(self._orderbys)
+        newone._joins = copy(self._joins)
+        newone._unions = copy(self._unions)
+        newone._updates = copy(self._updates)
         return newone
 
     @builder