---
title: "Comment by Rishabh Mishra on \"One Zone Lost Power and Half the UK Went Down: Building MERN Apps That Survive It\" | Hashnode"
description: "One addition to the checklist: a replica set across zones is not a backup. A bad deploy or an accidental delete will replicate to the other zones just as fast."
url: "https://hashnode.com/posts/one-zone-lost-power-and-half-the-uk-went-down-building-mern-apps-that-survive-it/6adc529c09e8eba9f38aee03/comment/6add70cb4b032073c0397d85"
---

[Discussion](https://hashnode.com/posts/one-zone-lost-power-and-half-the-uk-went-down-building-mern-apps-that-survive-it/6adc529c09e8eba9f38aee03)

Comment [One Zone Lost Power and Half the UK Went Down: Building MERN Apps That Survive It](https://hashnode.com/posts/one-zone-lost-power-and-half-the-uk-went-down-building-mern-apps-that-survive-it/6adc529c09e8eba9f38aee03)

[Rishabh Mishra](https://hashnode.com/@rushdeploy)

[Oct 25](https://hashnode.com/posts/one-zone-lost-power-and-half-the-uk-went-down-building-mern-apps-that-survive-it/6adc529c09e8eba9f38aee03/comment/6add70cb4b032073c0397d85)

One addition to the checklist: a replica set across zones is not a backup. A bad deploy or an accidental delete will replicate to the other zones just as fast. Keep a separate, tested restore outside that replica set.

[Nitesh Kumar Tudu](https://hashnode.com/@nitesh000)

[Oct 27](https://hashnode.com/posts/one-zone-lost-power-and-half-the-uk-went-down-building-mern-apps-that-survive-it/6adc529c09e8eba9f38aee03/comment/6add70cb4b032073c0397d85#reply-6ae09bc6d504fb6989441c52)

thanks, i'll update the blog.