diff --git a/modules/system/services/outline.nix b/modules/system/services/outline.nix
index 90bccb6..72f673d 100644
--- a/modules/system/services/outline.nix
+++ b/modules/system/services/outline.nix
@@ -78,5 +78,7 @@ in
       '';
       restoreCommand.postRestore = "sudo --user=${user} pg_restore --clean --if-exists --dbname outline ${dataDir}/db.dump";
     };
+
+    custom.persist.directories = [ dataDir ];
   };
 }