如果Amazon S3或任何其他S3兼容系统适合您,您可以尝试以下模块:
https://www.drupal.org/project/s3fs
https://www.drupal.org/project/media_mover
此教程也可能对您有用: http://www.symphonythemes.com/drupal-blog/easy-amazon-s3-drupal-s3fs