Notion of FileSetMapping, sort of a subscription of a machine to some fileset. StreamingJob components for syncing a FileSet. FileSyncService introduced which provides atomic sync operations.
Introduced SyncFlows to help organize direction of syncing. Originally, this was a backup project. But the not-thought-out thought of multiple machine syncs to file sets, implies syncing back down to the machine (or else there will be sync wars between machines).