# backup plan when cloud infra failed

When the whole deployment infra is based on the cloud service, and the AWS experienced outrage at a region, for example,

![](https://1789169385-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MLM-8kco4SQ9CwGgq1L%2F-MN-P99rV0yyHuMOMSMz%2F-MN-PLgwbGjV5YsKCIAQ%2FScreen%20Shot%202020-11-25%20at%209.17.16%20AM.png?alt=media\&token=033722f6-a495-4d85-8c59-75ee2aa7ea95)

In this scenario, need to prepare:

* migrate all the service on multiple regions (all the service from scratch) 
* make sure data receiving always work; so that even they might not be able to get the processed data, they are able to get it after the service is recovered without resending the data.
* **identify the issue and alert customers before they noticed it.**   

What event will trigger a notification?

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