Setting up a home file server/media box

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http://crunchbanglinux.org – I am looking for tip regarding software and hardware to put a backup  and  media sharing box on my home network.  Would an atom nettop with external usb powered drives do the trick? I know nothing about samba or raid:The requirements are: low power consumption < 30 watts (atom?)  low noise (no fan?)2+ spinning drives with cross drive backup*nux oswpa if wirelesssmall form factor (less than 10 liters)Desired qualities:4 spinning drivesworks as home theater boxfast wpa wireless (150 mps)1 power cordWorks as wireless router/switch  Would an atom net-top with external u (HowTos)