diff --git a/stack.env b/stack.env
index 06df7ef..dbe9b6c 100644
--- a/stack.env
+++ b/stack.env
@@ -1,9 +1,9 @@
-# ==============================================================================
+# =============================================================================
 # Prefect Stack Environment Variables
-# ==============================================================================
+# =============================================================================
 # This file is used by Portainer when deploying from Git repository.
 # Sensitive values (marked CHANGE_ME) must be set in Portainer UI.
-# ==============================================================================
+# =============================================================================
 
 # Tailscale
 TS_AUTHKEY=CHANGE_ME
@@ -13,3 +13,8 @@ DB_HOST=postgresql.taila5ad8.ts.net
 DB_PORT=5432
 DB_USER=prefect
 DB_PASSWORD=CHANGE_ME
+
+# S3 Storage (Garage) - for backup worker
+S3_ACCESS_KEY=CHANGE_ME
+S3_SECRET_KEY=CHANGE_ME
+S3_ENDPOINT_URL=https://s3.taila5ad8.ts.net