SCP, SFTP, and WebDAV are all woefully inefficient for large data transfers as a result of bandwidth delay product.* They typically use a single TCP session an

SCP, SFTP, and WebDAV are all woefully inefficient for large data transfers as a result of bandwidth delay product.* They typically use a single TCP session and transmit files serially. WebDAV does support an mput, however. S3 does a much better job of utilizing available bandwidth. It supports multipart parallel uploads and resumes nicely. In my experience, it will usually fully saturate any available upload capacity. There are other protocols that may be more efficient for high bandwidth, high latency connections, i.e. WDT from facebook or UDT, but S3 does okay. *https://en.wikipedia.org/wiki/Bandwidth-delay_product https://en.wikipedia.org/wiki/Bandwidth-delay_product