I've setup an ownCloud server behind a NAT network. Now I want to access it outside the NAT, but I don't have access to the router so I cannot simply setup a port forwarding to solve the problem. So I want to setup another ownCloud server outside the NAT, which will have a public IP. Now I'm wondering whether it is possible to sync files between them.
The reason why I don't simply only use the public ownCloud server is because uploading and downloading files from LAN server is much faster.