Converting Google Spreadsheet to Excel with AppScript and send it via email

I made a question in how to Convert Google Spreadsheet to excel with AppScript 2015

and been guided to the answer in this other post https://stackoverflow.com/a/27281729/1677912

It seemed to work, but I had a new problem: the created file is smaller than it should be, and doesn’t open (corrupted). Here is the complete code:

function crearBackUp() {

//pone en la variable -sheet- a la hoja activa
var sheet = SpreadsheetApp.getActiveSpreadsheet();

//obtiene la fecha para ponerle al nombre del archivo
var d = new Date();
var mes = d.getMonth() + 1;
var anio = d.getFullYear();

var nombre = "backUP_BaseDatos_BN_"+mes.toString()+anio.toString();

//creo una copia y obtengo el ID para pasarlo a Drive
var theBKP = sheet.copy(nombre);
var theID = theBKP.getId();

//Abro el arch con Drive y exporto a XLS
var file = Drive.Files.get(theID);
var url = file.exportLinks[MimeType.MICROSOFT_EXCEL];

var response = UrlFetchApp.fetch(url);      
var doc = response.getBlob();

//crea el archivo con DriveApp pasasndole el Blob
var theFile = DriveApp.createFile(doc).setName(file.title + '.xlsx');

//Manda el mail
MailApp.sendEmail('email@gmail.com', 'Subject','Mensaje',   {
  filename: nombre,
  attachments: theFile
  })
}

I wonder if there isn’t an easier or more direct method to do it, as this is for me quite a workaround.

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