diff --git a/backup.nix b/backup.nix
index c8d1479..af71197 100644
--- a/backup.nix
+++ b/backup.nix
@@ -16,6 +16,7 @@ in {
   users.users."${user}" = {
     isSystemUser = true;
     inherit group;
+    extraGroups = [ "misskey" "redis-misskey" ];
   };
   users.groups."${group}" = { };
   services.postgresql.ensureUsers = [{ name = user; }];