Use SSH with rsync for secure transfers.
With this method, you define an SSH key pair—a “Private” and “Public” key set. You apply the public instance of the key to an upload account that has been configured to access the desired storage group. You then tell Rsync which Secure Shell (SSH) client to use so content is encrypted as it traverses the public Internet. The private key is incorporated within commands to resolve with the public instance to grant access to the target storage group. Other requirements apply, and are discussed here.