[ubuntu] Connect External HD to Netowork via router (via USB)

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http://ubuntuforums.org – I'm running Ubuntu 12.10, my wife has a mac and all the other computers are either older versions of Ubuntu and or Windows. I would like to buy a (or two) external HD's for backup, mainly for pictures etc... I would like the files accesible from the devices on the network. I was thinking of getting two 1tb or 2tb HD's. Is there a website or reference or someplace that I can get some help on this topic or pointers? Thanks, D (Hardware)