Low-Cost Disaster Recovery with AWS: The Multi-Region Backup and Restore Approach.
Cloudairy
16 Apr, 2024
Disasters can strike at any time and can cause serious, widespread outages that affect an organization’s ability to run its workloads.
To protect against such events, many organizations opt to use multiple regions in their disaster recovery (DR) strategy. This approach provides resiliency and protection workloads by spreading them across geographically diverse regions.
However, deploying a DR solution for multi regions comes with its own set of challenges.
The Recovery Time Objective (RTO) and The Recovery Point Objective (RPO)
for a backup and restore strategy will be longer than for other DR strategies. This is because the data must be restored from backups. This means that in the event of a disaster, it may take more time to recover data and applications, resulting in longer downtimes and greater data loss.
The following are some of the benefits of using a backup and restore strategy for DR across multiple Regions:
🎯Cost-effective
🎯Easy to implement
🎯Can be used with any type of workload
Here are some of the drawbacks of using a backup and restore strategy for DR across multiple Regions:
🎯Longer RTO and RPO
🎯Increased risk of data loss
🎯Requires manual intervention
The most significant aspect is that the Organizations should carefully consider the benefits and drawbacks of using a backup and restore strategy for DR across multiple Regions before making a decision. If the organization is willing to accept the longer RTO and RPO, then this strategy can be a cost-effective way to protect their data from widespread outages.
Ultimately, the best disaster recovery strategy for an organization will depend on a variety of factors, including its-
★budget
★the criticality of its workloads and
★its tolerance for downtime and data loss.
Cloud planning
A recovery Point Objective (RPO) is a time-based measurement of the maximum amount of data loss that is tolerable to an organization.
In simpler terms, RPO determines how much data an organization can afford to lose.
For example, if the RPO is set to one hour, it means that in the event of a disaster, the organization can tolerate losing up to one hour’s worth of data. This implies that the backup and recovery processes should be designed to ensure that systems and data are backed up at least every hour.
What is RTO
Recovery Time Objective (RTO) is a metric that defines the maximum acceptable amount of time for a business process or system to be restored after a disruption. It is a critical component of any disaster recovery plan, as it helps to ensure that critical systems and data are available when they are needed most.
The RTO is typically measured in minutes, hours, or days. The specific RTO that is appropriate for an organization will depend on the nature of the business and the criticality of the systems and data that need to be protected.
For example, a financial institution may have an RTO of minutes for its trading systems, while a manufacturing company may have an RTO of hours for its production systems.
The RTO should be aligned with the organization’s business needs and risk tolerance
Architecture Overview
The diagram in Figure 3 showcases the AWS services used to maintain a multi-Region/backup and restore strategy. The following sections list the components of the example of the application presented in the figures, which works as follows:
Amazon Route53
Route 53 health checks are used to monitor the health and performance of web applications, servers, and resources. They enable DNS failover configurations. CloudWatch alarms are used to automate notifications of health status changes, allowing for quick action to restore service. However, there may be a delay between health check failure and SNS notification due to the default 5-minute polling interval of CloudWatch alarms, which can be configured to be shorter.
Amazon CloudWatch
Amazon CloudWatch integrates with Route 53 health checks to provide a comprehensive view of the health of your applications and resources. You can use CloudWatch to:
★Verify that a health check is properly configured.
★Review the status of a health check over a specific time.
★Configure CloudWatch to send an Amazon Simple Notification Service (SNS) alert when the status of a health check is unhealthy.
It is important to note that there may be a delay of several minutes between the time that a health check fails and the time that you receive the associated SNS notification. This is because CloudWatch polls the health check periodically, and there may be a delay between the time that the health check fails and the time that CloudWatch polls it.
The integration between CloudWatch and Route 53 health checks provides a powerful way to monitor the health of your applications and resources. By using CloudWatch, you can be alerted to unhealthy health checks as soon as possible, so that you can take action to restore the application or resource.
Low-Cost Disaster Recovery with AWS: The Multi-Region Backup and Restore Approach.
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