diff --git a/ansible/group_vars/all.yml b/ansible/group_vars/all.yml
index cf3e4ca52b..000e53df37 100644
--- a/ansible/group_vars/all.yml
+++ b/ansible/group_vars/all.yml
@@ -625,9 +625,7 @@ enable_manila_backend_generic: "no"
 enable_manila_backend_hnas: "no"
 enable_manila_backend_cephfs_native: "no"
 enable_manila_backend_cephfs_nfs: "no"
-# TODO(mgoddard): Change this to a plain "no" when support enable_xtrabackup
-# has been removed.
-enable_mariabackup: "{{ enable_xtrabackup | default('no') }}"
+enable_mariabackup: "no"
 enable_masakari: "no"
 enable_mistral: "no"
 enable_monasca: "no"
diff --git a/releasenotes/notes/remove-enable-xtrabackup-8109d5160d9cd8a9.yaml b/releasenotes/notes/remove-enable-xtrabackup-8109d5160d9cd8a9.yaml
new file mode 100644
index 0000000000..0ede16bf69
--- /dev/null
+++ b/releasenotes/notes/remove-enable-xtrabackup-8109d5160d9cd8a9.yaml
@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Removes support for the ``enable_xtrabackup`` variable that was deprecated
+    in favour of ``enable_mariabackup`` in the Train (9.0.0) release.