Abstract: A method and apparatus for synchronizing a file between a sender and a receiver. The sender comprises a base version of the file and optionally one or more delta files. The receiver issues a request to get updates for the file and indicates a unique ID associated with the version available at the receiver. The sender determines the version available to the receiver, and updates the receiver with all delta files accumulated since the receiver received the last update of the file. If the version of the receiver is older than the base version, then the base version and all delta files are sent to the receiver.