How We Upgrade Servers without Downtime

A Tyrannosaurus RexThis article was originally published on our old blog in 2012, but it is still true and worth repeating.

We normally operate two complete systems in different datacentres.  The first one serves our customers and the second replicates all of the data, in real time, and is standing by to take over.  If a disaster strikes the first location, the service is quickly switched to the second system.

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