This article describes how inSync makes backup of their data secure over WAN/VPN. It also provides links for further reading.
What is covered:
Security Guidelines that inSync uses for Remote Backup
Other inSync Knowledge Base Resources
The following features makes inSync secure and ready for deployment for your WAN and VPN users :
256-bit SSL network encryption
256-bit AES storage encryption
The client triggered architecture ensures that backup and restore requests are always initiated by the inSync clients. The inSync server (just like the e-mail and HTTP servers) never initiates an outbound request. This facilitates secure deployment in your DMZ, with just one-way inward (ANY to 6061) port forwarding in your firewall.
For a better understanding on WAN/VPN based backups, refer to the following Knowledge Base article.
For network troubleshooting, especially over WAN, use of the Microsoft PortQuery tool is explained here:
For more information on secure communication please refer to the White Paper: