A single point of failure (SPOF) is a part of a system that, when it fails, brings the entire system down. If that server goes down, your whole application becomes unavailable, impacting user…

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A single point of failure (SPOF) is a critical system component whose failure can bring down the entire system. SPOFs create vulnerabilities that can impact reliability, scalability, and security. Common SPOFs include databases, load balancers, application servers, and network connections. Strategies to eliminate SPOFs include redundancy, failover mechanisms, load balancing, geographic distribution, and continuous monitoring. Identifying and addressing SPOFs ensure robust and scalable systems capable of maintaining positive user experiences.

Single Point of Failure (SPOF) in System Design

TL;DR: Have redundancy, failover and altering when things go wrong.
Monitor the alerts. And run failover tests.
What is not said in the article: you double your cost and drastically increase architectural complexity and ongoing maintenance.
I don’t disagree with the key points of the article, but remember there is a time and place for everything, and most small-to-medium enterprises probably don’t need this. Instead, start with simple, easy to rebuild architecture and make sure you backups are working and tested for recovery.