I've had to sync one local fileserver directory (and all subdirs) to a remote server on the fly so whatever gets written to the local server appears to the remote.
I did have tried iocron but it's not recursive.
Tested some solutions but all they had some issues.
I ended up using watcher.py: https://github.com/greggoryhz/Watcher
Works flawlessly for 2months now. (local copy: http://www.valqk.com/assets/user/watcher.py )