I'm not that up on IT matters these days. I'm looking to get a NAS drive and wondered if anybody knows much about them. I notice you can get them for just over £100 and you can also pay £800+. Presumably the £800 one is tons better than the £100. How? What are the features I need to look out for? I want to have a good backup for my photographs currently sitting on my Mac. I would like my windows laptop to also use it. All that I've read so far just wants to sell me something rather than give me the nitty gritty on the differences etc.