We transfer all information between your server and BitCalm service through secure channel (TLS with 2048 bit key). In the same way we send all your backed up data to the Amazon S3 storage. This way we protect you from the so-called «Man in the middle» attack (https://en.wikipedia.org/wiki/Man-in-the-middle_attack)
We send your server’s backed up data directly to the Amazon S3. We do not have access to the transmitted information.