TFDSQliteBackup android delphi xe7

I am trying to make backup of my Android application, application made in Delphi. I am using the TFDSQliteBackup component with the following code, it executes and creates the file, but the file is blank does anyone know how to proceed ??

try
  try
    DataModule1.FDConnection1.Close;
    DataModule1.backup.DestDatabase:= '/storage/sdcard0/tedesco.controlefinanceiro.SQLITE3';
    DataModule1.backup.Backup;
  except
    on e:Exception do
    begin
      ToastMessage(e.Message);
    end;
  end;
finally
   ToastMessage('Backup Concluido');
end;