FreeNAS replication over a WAN link

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http://serverfault.com – I am redesigning a network as such: One Server 2012 essentials domain controller and three backup servers spread over three geographical locations (one of which will be with the DC). For the purpose of redundancy, I want to have files put directly onto the DC, then pushed over to a FreeNAS box, then everything on the FreeNAS box to be replicated over a WAN link to the other two locations. Or have everything pushed over to the FreeNAS box, then have everyone in the remote locations (about 30 people) authenticate through AD and download everything they need through an FTP site linked to the Fr (HowTos)