Accessing my network disk while on a different network?

I was wondering how I can access my wireless hard drive that I have plugged into my Airport Extreme from anywhere in the world? I have my entire internal hard drive backed up on the external disk and I would like to be able to access all of that information wirelessly from anywhere in the world.

Do I have to setup a server or how exactly can I do this?

QA AirPort Extreme Base Station

QA AirPort Extreme Base Station

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