diff --git a/openstack/block_storage/v3/backup.py b/openstack/block_storage/v3/backup.py
index 64987183a..9131e5914 100644
--- a/openstack/block_storage/v3/backup.py
+++ b/openstack/block_storage/v3/backup.py
@@ -50,6 +50,8 @@ class Backup(resource.Resource):
     data_timestamp = resource.Body('data_timestamp')
     #: backup description
     description = resource.Body("description")
+    #: The UUID of the encryption key. Only included for encrypted volumes.
+    encryption_key_id = resource.Body("encryption_key_id")
     #: Backup fail reason
     fail_reason = resource.Body("fail_reason")
     #: Force backup
@@ -86,6 +88,8 @@ class Backup(resource.Resource):
     #: The UUID of the volume.
     volume_id = resource.Body("volume_id")
 
+    _max_microversion = "3.64"
+
     def create(self, session, prepend_key=True, base_path=None, **params):
         """Create a remote resource based on this instance.
 
diff --git a/openstack/tests/functional/block_storage/v3/test_backup.py b/openstack/tests/functional/block_storage/v3/test_backup.py
index bb7708888..2849419e5 100644
--- a/openstack/tests/functional/block_storage/v3/test_backup.py
+++ b/openstack/tests/functional/block_storage/v3/test_backup.py
@@ -69,6 +69,21 @@ class TestBackup(base.BaseBlockStorageTest):
         self.assertEqual(self.BACKUP_NAME, sot.name)
         self.assertEqual(False, sot.is_incremental)
 
+    def test_create_metadata(self):
+        metadata_backup = self.user_cloud.block_storage.create_backup(
+            name=self.getUniqueString(),
+            volume_id=self.VOLUME_ID,
+            metadata=dict(foo="bar"))
+        self.user_cloud.block_storage.wait_for_status(
+            metadata_backup,
+            status='available',
+            failures=['error'],
+            interval=5,
+            wait=self._wait_for_timeout)
+        self.user_cloud.block_storage.delete_backup(
+            metadata_backup.id,
+            ignore_missing=False)
+
     def test_create_incremental(self):
         incremental_backup = self.user_cloud.block_storage.create_backup(
             name=self.getUniqueString(),
diff --git a/openstack/tests/unit/block_storage/v3/test_backup.py b/openstack/tests/unit/block_storage/v3/test_backup.py
index f2da69e5b..9e7174d8d 100644
--- a/openstack/tests/unit/block_storage/v3/test_backup.py
+++ b/openstack/tests/unit/block_storage/v3/test_backup.py
@@ -27,6 +27,7 @@ BACKUP = {
     "created_at": "2018-04-02T10:35:27.000000",
     "updated_at": "2018-04-03T10:35:27.000000",
     "description": 'description',
+    "encryption_key_id": "fake_encry_id",
     "fail_reason": 'fail reason',
     "id": FAKE_ID,
     "name": "backup001",
@@ -55,7 +56,7 @@ class TestBackup(base.TestCase):
         self.sess = mock.Mock(spec=adapter.Adapter)
         self.sess.get = mock.Mock()
         self.sess.post = mock.Mock(return_value=self.resp)
-        self.sess.default_microversion = None
+        self.sess.default_microversion = "3.64"
 
     def test_basic(self):
         sot = backup.Backup(BACKUP)
@@ -67,6 +68,7 @@ class TestBackup(base.TestCase):
         self.assertTrue(sot.allow_list)
         self.assertTrue(sot.allow_get)
         self.assertTrue(sot.allow_fetch)
+        self.assertIsNotNone(sot._max_microversion)
 
         self.assertDictEqual(
             {
@@ -104,6 +106,7 @@ class TestBackup(base.TestCase):
                          sot.project_id)
         self.assertEqual(BACKUP['metadata'], sot.metadata)
         self.assertEqual(BACKUP['user_id'], sot.user_id)
+        self.assertEqual(BACKUP['encryption_key_id'], sot.encryption_key_id)
 
     def test_create_incremental(self):
         sot = backup.Backup(is_incremental=True)
@@ -124,7 +127,7 @@ class TestBackup(base.TestCase):
                     'incremental': True,
                 }
             },
-            microversion=None,
+            microversion="3.64",
             params={}
         )
 
@@ -137,7 +140,7 @@ class TestBackup(base.TestCase):
                     'incremental': False,
                 }
             },
-            microversion=None,
+            microversion="3.64",
             params={}
         )