If you would like a client application for Amazon S3 and Google Cloud then DragonDisk will permit you to manage the online storage from these accounts from your desktop computer. These storage spaces can be used as offsite backup locations for important files especially if you have a business DragonDisk allows you to upload/download files to Amazon S3 and Google Cloud accounts, copy and move files between Amazon S3 accounts, synchronize folders, set bucket permissions, generate HTTP or Torrent URL and more.
Upload and download performance is improved by its support for Reduced Redundancy Storage (RRS) which comes with a multi-threaded HTTP/HTTPS engine.