diff --git a/backup.py b/backup.py
index 7698cb6..9820cde 100755
--- a/backup.py
+++ b/backup.py
@@ -73,7 +73,9 @@ def run_backup(page: Page) -> None:
             export_file_link.wait_for(state="visible", timeout=15 * 60 * 1000)
             print("export ready")
         else:
-            print("Export Library button not found, using latest ready export link")
+            raise RuntimeError(
+                "Export Library button missing or not visible; cannot request a fresh export"
+            )
 
     print("download export")
     export_link = page.get_by_role("link", name="Your export from").first