diff --git a/clusters/cl01tl/platform/matrix-synapse/templates/external-secret.yaml b/clusters/cl01tl/platform/matrix-synapse/templates/external-secret.yaml
index 8112aaf34..77b290fa4 100644
--- a/clusters/cl01tl/platform/matrix-synapse/templates/external-secret.yaml
+++ b/clusters/cl01tl/platform/matrix-synapse/templates/external-secret.yaml
@@ -190,3 +190,35 @@ spec:
         key: /cloudflare/tunnels/matrix-hookshot
         metadataPolicy: None
         property: token
+
+---
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: matrix-synapse-postgresql-16-cluster-backup-secret
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app.kubernetes.io/name: matrix-synapse-postgresql-16-cluster-backup-secret
+    app.kubernetes.io/instance: {{ .Release.Name }}
+    app.kubernetes.io/version: {{ .Chart.AppVersion }}
+    app.kubernetes.io/component: database
+    app.kubernetes.io/part-of: {{ .Release.Name }}
+spec:
+  secretStoreRef:
+    kind: ClusterSecretStore
+    name: vault
+  data:
+    - secretKey: ACCESS_KEY_ID
+      remoteRef:
+        conversionStrategy: Default
+        decodingStrategy: None
+        key: /aws/keys/cl01tl-matrix-synapse-postgresql
+        metadataPolicy: None
+        property: access_key
+    - secretKey: ACCESS_SECRET_KEY
+      remoteRef:
+        conversionStrategy: Default
+        decodingStrategy: None
+        key: /aws/keys/cl01tl-matrix-synapse-postgresql
+        metadataPolicy: None
+        property: secret_key