Mission-critical computing is an umbrella term for any information technology (IT) system or network device whose loss would cause business operations to fail.
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When deploying mission-critical computing, businesses should evaluate technical requirements for resilience and application availability, along with business requirements for return on investment and cost. For example, if a server supports day-to-day operations, it should have multiple redundant power supplies and backups. Depending on the company's budget and data center physical infrastructure, this could mean N+1, N+2 or even higher redundancy.