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We’re doomed. Seriously. One of these days it’ll be all over for us. But not for our photos, Facebook postings, e-mails, and music files. Barring a global nuclear inferno, the stuff we store online will be around long after we’re dead. It’s good news for friends and loved ones who want something to remember us by. Except they may not be able to get at it, unless you make the right moves now. Given that Facebook has more than 1 billion users, it’s not unreasonable to assume that a few million of them are dead by now. What happens to their postings and photos? And the files they’ve stored at Google and Yahoo and iCloud and Instagram and countless other cloud-based services? Hardly any of us think about it, but now that we live our lives online, we’d better start.