title: Export a Google Sheet to Google Drive in Excel format with Apps Script
body: <p>I would like to create a backup of my Google Spreadsheet into my Google Drive folder, but as an Excel file.
  I managed to create a code that create a copy of the gsheet and save it into the folder, but I could not change the code to save it as an Excel file. </p>
  
  <p>Could you please help me with it?</p>
  
  <pre><code>function makeCopy() {
    var formattedDate = Utilities.formatDate(new Date(), "CET", "yyyy-MM-dd' 'HH:mm");
    var name = "Backup Copy " + formattedDate;
    var destination = DriveApp.getFolderById("1vFL98cgKdMHLNLSc542pUt4FMRTthUvL");
    var file = DriveApp.getFileById("2SqIXLiic6-gjI2KwQ6OIgb-erbl3xqzohRgE06bfj2c")
    file.makeCopy(name, destination);
  }
  </code></pre>