Network server and backup

I have a home network with 3 macs and 2 windows computers. I need a solution to alow me to share the media (itunes pictures and movies) from the network to the various computers and to be able to backup the media. Any ideas?
thanks

I thought about that but:
1. how do I back up the NAS?
2. If I confugure it as RAID 1 I sort of get a back up in case of a drive crash but if a file is deleted or corrupted I'm screwed.

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    Message was edited by: SilverSkyRat

    I don't have enough points to make a user tip. so I thought I'd share this way
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    Message was edited by: SilverSkyRat

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