[ubuntu] Redundant servers - Simplest way?

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http://ubuntuforums.org – I have been learning and experimenting with Ubuntu server. I am curious about a couple of things regarding redundant samba fileservers and redundant IMAP email. I have three physical locations on a vLan (let's say ...LA, NY, Paris) and need to have a Samba fileserver at each one. Ideally I want the files on each server to be mirrored on the other two servers so that all three locations would have all files. The files are quite large and the bandwidth is limited between locations. Usually the users at one location do not need files from the other two locations until the next day. We want fil (Hardware)