Guix

Lsyncd watches a local directory trees event monitor interface (inotify or fsevents). It aggregates and combines events for a few seconds and then spawns one (or more) process(es) to synchronize the changes. By default this is rsync, which must be installed on all source and target machines. Lsyncd is thus a light-weight live mirror solution that is comparatively easy to install not requiring new file systems or block devices and does not hamper local file system performance.