diff --git a/pbs-api-types/src/datastore.rs b/pbs-api-types/src/datastore.rs
index 32558066..b75bcf60 100644
--- a/pbs-api-types/src/datastore.rs
+++ b/pbs-api-types/src/datastore.rs
@@ -809,7 +809,7 @@ impl std::cmp::PartialOrd for BackupType {
 
 #[api(
     properties: {
-        "backup-ns": { type: BackupNamespace },
+        "backup-ns": { type: BackupNamespace, optional: true },
         "backup-type": { type: BackupType },
         "backup-id": { schema: BACKUP_ID_SCHEMA },
     },