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See exactly what a sync will do before it runs, then watch it happen live — all from the terminal, even over SSH.
Save a Source → Destination pair once and rerun it with a keystroke.
Preview every transfer as a +/~/- diff with stats before a single byte is written.
Destructive flags are opt-in and confirmed the moment you toggle them on.
A progress bar with byte and file counts, plus one-key cancellation.
Either side of a task can be a user@host:/path — upload or download, same task type.
Optional numbered, hardlinked versions via rsync's --link-dest.