diff --git a/cluster_upgrade/handlers.py b/cluster_upgrade/handlers.py
index d4b7f71..9e79952 100644
--- a/cluster_upgrade/handlers.py
+++ b/cluster_upgrade/handlers.py
@@ -14,6 +14,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import copy
 import six
 
 from nailgun.api.v1.handlers import base
@@ -152,13 +153,14 @@ class CreateUpgradeReleaseHandler(base.BaseHandler):
 
         Overwrite base default_mapping by orig default_maping values.
         """
+        base_nets = copy.deepcopy(base_nets)
+        orig_nets = copy.deepcopy(orig_nets)
         orig_network_dict = {n['id']: n for n in orig_nets}
         for base_net in base_nets:
             orig_net = orig_network_dict.get(base_net['id'])
-            if orig_net is None:
-                orig_net = base_net
-            base_net['default_mapping'] = orig_net['default_mapping']
-        return base_net
+            if orig_net is not None:
+                base_net['default_mapping'] = orig_net['default_mapping']
+        return base_nets
 
     @base.serialize
     def POST(self, cluster_id, release_id):
@@ -174,14 +176,15 @@ class CreateUpgradeReleaseHandler(base.BaseHandler):
         base_release = self.get_object_or_404(objects.Release, release_id)
         orig_cluster = self.get_object_or_404(objects.Cluster, cluster_id)
         orig_release = orig_cluster.release
-
         network_metadata = self.merge_network_roles(
             base_release.network_roles_metadata,
             orig_release.network_roles_metadata)
-        data = objects.Release.to_dict(base_release)
+        data = dict(base_release)
         data['network_roles_metadata'] = network_metadata
         data['name'] = '{0} Upgrade ({1})'.format(
             base_release.name, orig_release.id)
+        deployment_tasks = objects.Release.get_deployment_tasks(base_release)
+        data['deployment_tasks'] = deployment_tasks
         del data['id']
         new_release = objects.Release.create(data)
-        return new_release.to_dict()
+        return objects.Release.to_dict(new_release)
diff --git a/cluster_upgrade/tests/test_handlers.py b/cluster_upgrade/tests/test_handlers.py
index ad7239a..819a1fc 100644
--- a/cluster_upgrade/tests/test_handlers.py
+++ b/cluster_upgrade/tests/test_handlers.py
@@ -247,3 +247,19 @@ class TestCopyVipsHandler(base.BaseIntegrationTest):
 
         self.assertEqual(resp.status_code, 200)
         self.assertTrue(copy_vips_mc.called)
+
+
+class TestCreateUpgradeReleaseHandler(base.BaseIntegrationTest):
+
+    def test_clone_release(self):
+        new_cluster = self.env.create_cluster(api=False)
+        release = self.env.create_release(
+            operating_system=consts.RELEASE_OS.ubuntu, version="new_version")
+        uri = reverse(
+            'CreateUpgradeReleaseHandler',
+            kwargs={'cluster_id': new_cluster.id, 'release_id': release.id})
+        resp = self.app.post(uri, headers=self.default_headers)
+        self.assertEqual(resp.status_code, 200)
+        self.assertEqual(
+            '{0} Upgrade ({1})'.format(release.name, new_cluster.release.id),
+            resp.json_body['name'])