diff --git a/octaviaclient/osc/v2/constants.py b/octaviaclient/osc/v2/constants.py
index 0e3cccf..09cb551 100644
--- a/octaviaclient/osc/v2/constants.py
+++ b/octaviaclient/osc/v2/constants.py
@@ -122,7 +122,9 @@ MEMBER_ROWS = (
     'updated_at',
     'weight',
     'monitor_port',
-    'monitor_address')
+    'monitor_address',
+    'backup'
+)
 
 MEMBER_COLUMNS = (
     'id',
diff --git a/octaviaclient/osc/v2/member.py b/octaviaclient/osc/v2/member.py
index d94217d..fc84101 100644
--- a/octaviaclient/osc/v2/member.py
+++ b/octaviaclient/osc/v2/member.py
@@ -101,6 +101,19 @@ class CreateMember(command.ShowOne):
             metavar='<name>',
             help="Name of the member."
         )
+        backup = parser.add_mutually_exclusive_group()
+        backup.add_argument(
+            '--disable-backup',
+            action='store_true',
+            default=None,
+            help="Disable member backup (default)"
+        )
+        backup.add_argument(
+            '--enable-backup',
+            action='store_true',
+            default=None,
+            help="Enable member backup"
+        )
         parser.add_argument(
             '--weight',
             metavar='<weight>',
@@ -197,6 +210,19 @@ class SetMember(command.Command):
             metavar='<name>',
             help="Set the name of the member"
         )
+        backup = parser.add_mutually_exclusive_group()
+        backup.add_argument(
+            '--disable-backup',
+            action='store_true',
+            default=None,
+            help="Disable member backup (default)"
+        )
+        backup.add_argument(
+            '--enable-backup',
+            action='store_true',
+            default=None,
+            help="Enable member backup"
+        )
         parser.add_argument(
             '--weight',
             metavar='<weight>',
diff --git a/octaviaclient/osc/v2/utils.py b/octaviaclient/osc/v2/utils.py
index 3e0d2d4..f4e8bba 100644
--- a/octaviaclient/osc/v2/utils.py
+++ b/octaviaclient/osc/v2/utils.py
@@ -269,6 +269,8 @@ def get_member_attrs(client_manager, parsed_args):
             'pool',
             client_manager.load_balancer.member_list
         ),
+        'enable_backup': ('backup', lambda x: True),
+        'disable_backup': ('backup', lambda x: False),
         'weight': ('weight', int),
         'subnet_id': (
             'subnet_id',
diff --git a/octaviaclient/tests/unit/osc/v2/constants.py b/octaviaclient/tests/unit/osc/v2/constants.py
index 57ec228..ce7f589 100644
--- a/octaviaclient/tests/unit/osc/v2/constants.py
+++ b/octaviaclient/tests/unit/osc/v2/constants.py
@@ -115,6 +115,7 @@ L7RULE_ATTRS = {
 MEMBER_ATTRS = {
     "project_id": uuidutils.generate_uuid(dashed=True),
     "name": "test-member",
+    "backup": False,
     "weight": 1,
     "admin_state_up": True,
     "subnet_id": uuidutils.generate_uuid(dashed=True),
diff --git a/octaviaclient/tests/unit/osc/v2/test_member.py b/octaviaclient/tests/unit/osc/v2/test_member.py
index 0644835..2cf2e85 100644
--- a/octaviaclient/tests/unit/osc/v2/test_member.py
+++ b/octaviaclient/tests/unit/osc/v2/test_member.py
@@ -90,11 +90,12 @@ class TestCreateMember(TestMember):
             'protocol_port': self._mem.protocol_port,
             'weight': self._mem.weight,
             'admin_state_up': True,
-            'pool_id': self._mem.pool_id}
+            'pool_id': self._mem.pool_id,
+            'backup': False}
 
         arglist = ['pool_id', '--address', '192.0.2.122',
                    '--protocol-port', '80',
-                   '--weight', '1', '--enable']
+                   '--weight', '1', '--enable', '--disable-backup']
         verifylist = [
             ('address', '192.0.2.122'),
             ('protocol_port', 80),
@@ -108,7 +109,8 @@ class TestCreateMember(TestMember):
                 'member': {'ip_address': '192.0.2.122',
                            'protocol_port': self._mem.protocol_port,
                            'weight': self._mem.weight,
-                           'admin_state_up': True}})
+                           'admin_state_up': True,
+                           'backup': False}})
 
 
 class TestMemberDelete(TestMember):
@@ -140,9 +142,10 @@ class TestMemberSet(TestMember):
     def test_member_set(self, mock_attrs):
         mock_attrs.return_value = {'pool_id': 'test_pool_id',
                                    'member_id': 'test_mem_id',
-                                   'name': 'new_name'}
+                                   'name': 'new_name',
+                                   'backup': True}
         arglist = ['test_pool_id', 'test_mem_id', '--name',
-                   'new_name']
+                   'new_name', '--enable-backup']
         verifylist = [
             ('pool', 'test_pool_id'),
             ('member', 'test_mem_id'),
@@ -153,7 +156,8 @@ class TestMemberSet(TestMember):
         self.cmd.take_action(parsed_args)
         self.api_mock.member_set.assert_called_with(
             pool_id='test_pool_id', member_id='test_mem_id',
-            json={'member': {'name': 'new_name'}})
+            json={'member': {'name': 'new_name',
+                             'backup': True}})
 
 
 class TestMemberShow(TestMember):
diff --git a/releasenotes/notes/add_backup_member_support-8b406bb72654ba88.yaml b/releasenotes/notes/add_backup_member_support-8b406bb72654ba88.yaml
new file mode 100644
index 0000000..fc86f58
--- /dev/null
+++ b/releasenotes/notes/add_backup_member_support-8b406bb72654ba88.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Optional backup argument for member, in loadbalancer member create,
+    and loadbalancer member set.