Yup, what he said. Your account info is stored server-side. You could get on any internet capable PC in the world, download the free client software, and log in with your email address and password. All of your account details, including UI preferences, your friends list, etc are all stored on Anet's side.
If your PC crashes, or you have to reinstall Windows or something, all you need to do is install (or download) the client and log in.
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