A synchronization system schedules the reporting of synchronization states between a synchronization client computing device and a synchronization server appliance device, based on relevant events in the synchronization process. A file system hierarchy is built by a scanning module based on recursive scanning of the file system on the synchronization client computing device. Events are detected by a file system watcher function and announced to the scanning module via an event queue. If a file state change is detected, the scanning module creates a synchronization report describing the file state change and schedules transmission of the synchronization report to the synchronization server appliance device, dependent on a prior action (e.g., a last file state change for the file, the last synchronization or upload time, the last reporting time, etc.).