A few weeks ago, as a damp winter chill settled on San Francisco, Peter van Hardenberg decided it was time for some eggnog. He knew of an excellent homespun recipe from a former colleague at Heroku, a company that helps startups build cloud based apps. And if he recalled correctly, it was stored on one of Herokus many cloud servers. But when Van Hardenberg typed in the relevant URL, he found the cupboard was bare—lost to some long ago server maintenance. “It had just fallen off the internet,” he...

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