personal cloud storage server [closed]

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http://serverfault.com – I am behind a firewall/NAT and I want to setup a pogoplug like storage solution. I want to access my files from outside of the NAT. Easily, I can buy a pogoplug like device and I am done but I do not want to rely on them. I want to setup an externel webserver which serves just like the pogoplug.com. Your home computer connects to the external server and advertises your files.. I think this is the only way to access the computer behind the NAT device if you are not allowed to do any changes on the rules of the NAT device. I do not even know where to start. I searched and read but I could not se (HowTos)