Second this. When we needed to deal with somewhat similar issues (quickly transfer multi-gigabyte archives over massively unreliable link) , we ended up with FD

Second this. When we needed to deal with somewhat similar issues (quickly transfer multi-gigabyte archives over massively unreliable link) , we ended up with FDT ; it can be easily scripted , and transfers data between two hosts (without using a network of torrent peers) at that hosts' link speed. Used it to transfer builds between US and Russia, and Russia and China .