function copyFolder(src, dst)
{
  //copy folders
  var folders = src.getFolders();
  while (folders.hasNext())
  {
    var folder = folders.next();

    if (dst.getFoldersByName(folder.getName()).hasNext())
    {
      var newFolder = dst.getFoldersByName(folder.getName()).next();
    }
    else
    {
      var newFolder = dst.createFolder(folder.getName());
    }

    copyFolder(folder, newFolder);
  }

  //copy files
  var files = src.getFiles();
  while (files.hasNext())
  {
    var file = files.next();

    if (! dst.getFilesByName(file.getName()).hasNext())
    {
      file.makeCopy( file.getName(), dst);
    }
  }
}


function copyDrive()
{
  var source= DriveApp.getFolderById('SEM NECO DOPLN')

  var target = DriveApp.getFolderById('SEM NECO DOPLN')

  copyFolder (source, target);
}