Recommend Strategy: Disk Backup for Speed, Tape Backup to Save Your Bacon, Just Ask Google (Email)

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In Stack Overflow Architecture Update - Now At 95 Million Page Views A Month, a commenter expressed surprise about Stack Overflow's backup strategy: 

Backup is to disk for fast retrieval and to tape for historical archiving.

The comment was:

Really? People still do this? I know some organizations invested a tremendous amount in automated, robotic tape backup, but seriously, a site founded in 2008 is backing up to tape?

The Case of the Missing Gmail Accounts

I admit that I was surprised at this strategy too. In this age of copying data to disk three times for safety, I also wondered if tape backups were still necessary? Then, like in a movie, an event happened that made sense of everything, Google suffered the quintessential #firstworldproblem, gmail accounts went missing! Queue emphatic music. And what's more they were taking a long time to come back. There was a palpable fear in the land that email accounts might never be restored. Think about that. They might never be restored...


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