osync - A robust two way (bidirectional) file sync script based on rsync with fault tolerance, ACL support and time control
A two way filesync script running on bash Linux, BSD, Android, MacOSX, Cygwin, MSYS2, Win10 bash and virtually any system supporting bash). File synchronization is bidirectional, and can be run manually, as scheduled task, or triggered on file changes in daemon mode. It is a command line tool rsync wrapper with a lot of additional features baked in. This is a quickstart guide, you can find the full documentation on the author's site.