{
response.sendError(HttpSC.BAD_REQUEST_400, "No such dataset: " + dataset) ;
return ;
}
DatasetRef ref = DatasetRegistry.get().get(dataset) ;
DatasetGraph dsg = ref.dataset ;
HttpAction action = new HttpAction(requestIdAlloc.incrementAndGet(), dsg, request, response, false) ;
scheduleBackup(action, dataset) ;
}