DataCenter

To route data different center if 1 is offline then geoDNS Load balancer will redirect to the other one if one failed
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Some of the challenges

Traffic redirection: this one can use GeoDNS
Data synchronisation: how to replicate a data if 1 region failed
- A common strategy is to replicate the data across multiple data centers
Test and deployment: need to test to make sure that the application still work with the other region