We have 2 sites with Linux servers acting as file servers.
We would like some kind of routine to run every night to keep the 2
sites mirrored and up to date.
I.e., more recent data will be on both sites, i.e., some files are
being changed on one server while others are being changed on the
other server. After the sync/mirroring process all the files should
have been updated on both servers.
Any advice, free or commercial?