diff --git a/architecture-docs/panel-data-model.mmd b/architecture-docs/panel-data-model.mmd
index 818a805..0b144d5 100644
--- a/architecture-docs/panel-data-model.mmd
+++ b/architecture-docs/panel-data-model.mmd
@@ -13,5 +13,15 @@ erDiagram
         json configuration
         option[string] version
     }
+    backup["back-up"] {
+        string bucket
+        string endpoint
+    }
+    keypair {
+        string access_key
+        string secret_key
+    }
     operator ||--o{ deployment : has
     deployment }|--|| runtime : uses
+    deployment ||--o{ backup : has
+    backup ||--|{ keypair : authorises
diff --git a/architecture-docs/panel-data-model.svg b/architecture-docs/panel-data-model.svg
index 6af9534..205a41f 100644
--- a/architecture-docs/panel-data-model.svg
+++ b/architecture-docs/panel-data-model.svg
@@ -1 +1 @@
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