I absolutely love the Keep Remote Directory Up-to-date feature in Winscp. Unfortunately, I can\'t find anything as simple to use in OS X or Linux. I know the same thing can
To detect changed files, you could try fam (file alteration monitor) or inotify. The latter is linux-specific, fam has a bsd port which might work on OS X. Both have userspace tools that could be used in a script together with rsync.