Techniques to perform event-based synchronization of data among a plurality of endpoints are disclosed. In various embodiments, a user interaction associated with synchronization set data that has been synchronized based on synchronization events downloaded from a synchronization server configured to propagate changes via a synchronization event stream is observed. The observed user interaction is used to infer a user preference with respect to downloaded synchronization set data. Access is provided to synchronization event related data in a subsequent download in a manner determined based at least in part on the inferred user preference.