A server stores files and manages the synchronization of those files across client devices in accordance with user preferences that may be embodied in change management rules. A first version of a file has been designated to be synchronized across at least a first client and a second client. The first client accesses the first version of the file and creates a first modified version of the file, and the second client accesses the first version of the file and creates a second modified version of the file. When the first and second clients attempt to re-synchronize their respective modified versions of the file, the server determines a preferred version from among the available modified versions of the file according to change management rules. Then, the preferred version is stored by the server and is subsequently served for synchronization across the client devices.