In the traditional on-premises model, the entire responsibility of managing, from the hardware for compute, storage and networking to the application, falls on you. You must plan for various types of failures and how to deal with them by creating a [business continuity strategy](./concept-business-continuity-high-availability-disaster-recovery.md). With IaaS, the cloud service provider is responsible for the core infrastructure resiliency, including storage, networking, and compute. As you move from IaaS to PaaS and then to SaaS, you’ll find that you’re responsible for less and the cloud service provider is responsible for more.
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