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Originally Posted by Undertoad
Hard drives die at a rate of apx. 2% per year. That's terrible odds! But Google has offsite backups and RAIDs and professionals managing all of it. When their hard drives die, they hot-swap them and rebuild the data.
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Can confirm. Mr. Clod has worked at two different "cloud"-sized companies, though personal data storage didn't happen to be their business model. They had so many hard drives that one died roughly once a week. He says it's a little better now with solid state drives, but still--sending someone out to the data center to replace a dead drive is a standard maintenance chore, not an emergency.