We’ve all learned to distrust the computers in our own homes when it comes to backing up data. It pays to save your precious photos and documents to backup drives as well as to servers in data centers at faraway locations.

But in the age of cloud computing, where data is stored on Internet-connected servers, who backs up the cloud? In the past day, we’ve seen a trio of data losses that could be catastrophic for some users. T-Mobile said that some Sidekick smart phone users may have lost their data forever as a result of a catastrophic hardware failure at ...

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