CrushSync is an enterprise only feature. It provides real time file synchronizations through CrushFTP. The client runs on the local machine monitoring the specified folders. When a change is detected, the change is propagated to the CrushFTP server, and any other clients subscribed to that folder now get those same changes. Only the changed parts of large files are sent, compression is used to save on bandwidth, and bandwidth acceleration can be used as well. Client configurations can be pre-configured for deployment, and an advanced mode allows clients to encrypt the data at the client side so that the server can never access the raw data. Only clients that have the private key can. This allows for robust one way synchronizations where a client places a file in the folder, and its sent to the server encrypted, and downloaded and decrypted by other privileged clients. The client is launched as an automatically updating application over a web connection. You as the server administrator control when you want to update the application for end users.