Google Gmail Snafu Lesson: Backup, Backup, Backup

Gmail is hard at work restoring service to about 40,000 Gmail users after a software bug deleted their e-mail messages, folders, labels and filters. So, while things are looking good for those users affected by the bug, this episode proves, once again, that while Web-based services may be robust, you still have to take responsibility for your own data.

Google also takes responsibility. Ben Treynor, Google’s VP Engineering and Site Reliability Czar, said on Google’s Gmail blog that Google backs up all Gmail to tape. “Since the tapes are offline, they’re protected from such software bugs,” he blogged. “But restoring data from them also takes longer than transferring your requests to another data center, which is why it’s taken us hours to get the e-mail back instead of milliseconds.”

Treynor said a storage software update introduced the unexpected bug, which caused 0.02% of Gmail users to temporarily lose access to their e-mail.

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