New server, I've forgotten everything I did before!

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http://www.linuxquestions.org – Hi all I'm about to build a new server, I built one a couple of years ago to backup my laptop weekly and that was about it, now I want a much more complex server as I have more computers in the house now. This is what I'm after and any help is much appreciated. 1/ We know have 3 laptops I want to keep backed up, 2x Ubuntu 12.04 LTS and 1x Windows, with 4 different users. I would like to have the server hold the most current version of a file so no matter what computer was being used (Ubuntu or Windows) the most current vesion of a file would be available. So when I finished working on 1 lapt (HowTos)