This guide explains DRaaS as third-party replication, failover, and failback that keeps apps and data available during disruptions. It contrasts DR (tech recovery) with broader business continuity, and clarifies backups vs replication vs DRaaS (“cold→hot” recovery). Service models include self-service, assisted, and managed. Core practices: integrate DR with cybersecurity (incl. 3-2-1 backups), conduct routine pre-test/test/debrief drills, and shift from reactive DR to proactive “IT availability” via BIA, risk assessment, strategy, and continuous updates. It outlines how to build the business case (hard/soft costs, stakeholder needs), choose failover targets (on-prem, hosted, or cloud) based on strategy, mix of systems, cost, and failback, and offers implementation tips: tier apps, pair HA with DR, plan for multiple causes, test often, leverage all resources, and select a mature provider.

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