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A disaster is a sudden destructive event that can render an organization inoperable. Natural, human-made and hybrid disasters have different levels of predictability but they are barely preventable at an organization’s level. The only way to ensure the safety of an organization is to create a reliable disaster recovery plan based on the organization’s specific needs.
Source: https://thinkmobiles.com/posts/2346/
Risk assessments and business impact analyses are two key elements of a disaster recovery plan. Both involve assessing disruptive events and use the results to strengthen a disaster recovery strategy, but they are not interchangeable.
A DR site is a site that is to be used for a temporary period of time. Typically, the hope is that the DR failover will not be permanent.
Remote Storage is also known as Hierarchical Storage Management (or HSM) as it allows two tiers of data storage, the first being the hard disk, the second the data moved to tape. The files original size will still be displayed however. it will not be used when free space is calculated on the disk.
RPO is the recovery point objective: the parameter defines the amount of data you can lose without significant impact on production. RTO is the recovery time objective: the longest downtime your organization can tolerate and, thus, the maximum time you can have to complete recovery workflows.
Successful organizations change and expand with time, and their DR plans should be adjusted according to the relevant needs and recovery objectives. Test your plan right after you finish it and perform additional testing every time you introduce changes. Thus, you can measure the efficiency of a disaster recovery plan and ensure the recoverability of your assets.
The DR strategy can be implemented on a DIY (do it yourself) basis or delegated to a third-party vendor. The former choice is the way to sacrifice reliability in favor of the economy, while the latter one can be more expensive but more efficient.
