Constant sync between two nodes?

[Mailinglists at Soderlund.Org]

Hi all,

setting up another machine as a backup to my private mailserver. I would 
like to have a constant sync (preferably increments) of directories and 
files that I choose between the two, using the LAN between them.

They are both on a private NAT:ed DMZ so there are no worries for r-daemons 
and alike.

Anyone done this? What software/solution are to recommend?

Regards and TIA,

Niclas

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