Cross-cloud Disaster Recovery: A New Era of Cloud Computing

The ultimate guide to cross-cloud disaster recovery
Discover the advantages of cross-cloud disaster recovery, challenges of cross-cloud DR, and how N2WS makes cross-cloud DR strategies easy.
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It is an indisputable fact that a significant number of organizations are migrating applications to the cloud to take advantage of its scalability, adaptability, and cost-effectiveness. Therefore, it is crucial to establish robust cross-cloud disaster recovery (DR) systems to ensure uninterrupted availability and protection of digital assets.

The cloud may be highly scalable, but not without risk. Cyber threats, natural disasters, and human-induced errors have made DR systems a strategic necessity for businesses. Traditional DR approaches often prove insufficient as digital assets grow in both quantity and complexity. Adopting cross-cloud solutions can help address these shortcomings and ensure a comprehensive data protection strategy.

In this article, we’ll discuss optimal methods for DR within the cloud, the inefficiency of cross-region provision of DR within a single cloud provider, advantages of cross-cloud DR, challenges while adapting cross-cloud DR, and how N2WS helps in managing cross-cloud DR strategies.

The Traditional Method of Disaster Recovery Within the Cloud

Modern DR strategies are based on a solid foundation established by the traditional techniques utilized by leading cloud service providers like Amazon Web Services (AWS) and Microsoft Azure. Let’s explore these traditional techniques in greater depth.

Disaster Recovery in AWS

The approach to disaster recovery in AWS primarily revolves around the ability to recover applications quickly and efficiently. If an AWS customer encounters a situation where they need to recover apps and data, AWS offers the capability to launch recovery instances within mere minutes. 

This ensures minimal downtime and service disruption. Furthermore, these instances can be based on the most recent server state, or if the situation warrants, from a previous point in time of the user’s choosing.

RTO and RPO based on Storage Tier

The Recovery Time Objective (RTO) and Recovery Point Objective (RPO) — key metrics defining the acceptable time and data loss during the recovery process — can vary based on where the snapshots of the data reside. For example, you can calculate RTO and RPO based on storage tiers such as:

  • Standard EBS block storage: Designed for workloads requiring excellent efficiency and low latency. This storage tier has faster RTO and RPO times and is suitable for mission-critical applications.
  • Amazon S3: Highly scalable, durable, and secure object storage that provides a balance between performance and cost. RTO and RPO metrics might vary slightly compared to EBS block storage.
  • Glacier: It is an archival storage solution projected for long-term data archiving with retrieval times ranging from minutes to hours. As such, RTOs and RPOs are typically higher for data in Glacier.

Cross-Region DR

AWS recognizes that geographic redundancy is crucial for true disaster recovery. Hence, they offer cross-region disaster recovery for enterprises. This means that if your primary region faces a disaster or a service interruption, you can failover to an entirely separate region. This ensures continued data availability and application uptime.

Disaster Recovery in Azure

Microsoft Azure, another giant in the cloud space, provides a similar disaster recovery mechanism, albeit with its own terminologies and nuances.

Azure Site Recovery

Azure Site Recovery (ASR) is the flagship solution for disaster recovery in Azure. It plays a crucial role in replicating virtual machine (VM) workloads from one main location to another. This means that your applications and data remain accessible even if the primary site goes down.

Failover Mechanism

With ASR, you can failover to a secondary location, wherein the replicated data becomes live and applications remain accessible. This minimizes disruptions to users and business processes.

Both AWS and Azure have their place in the cloud ecosystem with robust and efficient disaster recovery strategies. While the terminologies and processes might differ slightly, the core objective remains the same. As we usher into a new era of cloud computing, cross-cloud disaster recovery solutions will further redefine these strategies.

Why Cross-Region DR Within Just One Cloud Provider is Inefficient

While many enterprises rely on cross-region DR within a single cloud provider as their go-to strategy, this method has its limitations. In this section, we’ll probe into why solely relying on cross-region DR in a single cloud provider might not be the most efficient approach.

Potential Capacity Issues in Secondary Regions

When enterprises create their disaster recovery plans, they often select a primary region for normal operations and a secondary region to kick in when the primary region fails. However, there’s a fundamental flaw in this strategy.

Insufficient Compute and Storage

If a regional failure occurs at a single site, it can result in a sudden surge of demand in the secondary (backup) region. If many businesses simultaneously initiate their DR plans and move their workloads to this secondary region, it can become overwhelmed. The region may not have the capacity to manage the sudden influx, leading to insufficient compute and storage resources. This can result in reduced performance, slower data retrieval times, or even outages.

Interdependence of Cloud Regions

Cloud regions, while geographically dispersed, aren’t always as independent as one might assume.

  • Replication Doesn’t Eliminate Human Error: Take, for example, AWS services like EBS (Elastic Block Store) snapshots or RDS (Relational Database Service) databases. These can be replicated in another region to strengthen redundancy and enhance security. However, this replication is not immune to human error. If someone makes a mistake when entering data, that error gets replicated. This renders the read replica inaccurate and undermines the very purpose of having a DR strategy in place.
  • Vulnerability to Accidental Deletions: Another pressing concern is the potential for accidental deletion. Imagine a scenario where an operator inadvertently deletes an entire application. If a company only employs a single cloud provider and relies on intra-provider replication, that deletion gets mirrored across regions. Without an external backup or a multi-cloud DR strategy, the application could be lost permanently.

While cross-region DR within a single cloud provider offers a level of redundancy, it isn’t a silver bullet. Companies must be aware of the constraints and potential pitfalls. As the proverb goes, “Don’t put all your eggs in one basket.” Diversifying disaster recovery strategies, possibly by leveraging multiple cloud providers or combining on-premises and cloud solutions, can provide a more comprehensive and fail-safe approach.

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Benefits of Cross-Cloud Recovery

By leveraging the strengths of multiple cloud providers, businesses can reinforce their DR and business continuity (BC) plans. Below we explore some benefits of adopting a cross-cloud disaster recovery approach.

Optimal Utilization of Best Features of Each Cloud Provider

Cloud providers in the market today come with their unique sets of features and offerings. This allows for flexibility, scalability, and revenue potential. It also allows:

  • Avoidance of Vendor Lock-in: Cross-cloud disaster recovery allows organizations to be more agile, as they are not tied down to the intricacies and limitations of one cloud provider. This ensures flexibility in decision-making and technological adaptation.
  • Best of Both Worlds: For instance, an enterprise might be inclined towards Azure for its exceptional compute power and storage capacity. Concurrently, they might find AWS’s processing prowess more aligned with their requirements. Cross-cloud disaster recovery enables harnessing the strengths of both, optimizing resource usage and enhancing service delivery.

Assured Business Continuity and Disaster Recovery

In the digital age, uninterrupted access to data and services is non-negotiable. By spreading data across different regions and platforms, the risk of a single point of failure significantly diminishes. This geographical and platform-based diversification is a cornerstone of a robust DR plan.

When data and apps are stored across multiple cloud environments, the speed of recovery from disasters is exponentially faster. This ensures minimal disruptions, safeguarding a company’s reputation and customer trust.

Enhanced Security Through Cross-Cloud Recovery

Security remains a top concern for enterprises in the digital realm. Adopting a cross-cloud recovery model empowers IT teams, as they can build customized solutions without the fear of producing isolated data repositories or accidentally creating vulnerabilities.

Different cloud providers bring unique security mechanisms to the table. Leveraging multiple clouds allows enterprises to benefit from varied encryption techniques, threat detection mechanisms, and response strategies.

With data mirrored across multiple environments, the impact of security incidents like breaches is weakened. The multi-cloud approach ensures that even if one environment is compromised, data integrity is maintained elsewhere, offering an added layer of protection.

Meeting Compliance and Regulatory Standards

For certain sectors, compliance isn’t just best practice; it’s mandatory. This is especially true for organizations in the public and financial sectors, as there are strict regulations around data protection. A multi-cloud approach naturally provides diversified storage, making it easier to adhere to standards that mandate data redundancy and fail-safe recovery mechanisms.

While single-cloud solutions may have been the norm in the early days of cloud computing, the future undoubtedly belongs to cross-cloud recovery. It combines flexibility with robustness, ensuring that organizations can deliver uninterrupted services while maintaining data integrity and security.

Challenges in the Adoption and Practicality of Cross-Cloud DR

While utilizing resources across multiple cloud providers offers several advantages, it also presents some unique hurdles for businesses. Here’s a deeper dive into these challenges.


The multi-cloud approach inherently adds layers of complexity to data and application management.

Data Management Issues

As enterprises distribute data sets across multiple cloud environments, the ability to track, synchronize, and manage data becomes exponentially more challenging. Merging data from diverse sources into unified data lakes or repositories becomes a huge task. The varying data models and formats across platforms further complicates this process.

Security and Lifecycle Management

Different cloud providers often come with distinct security protocols and data management practices. Aligning these diverse practices to create a cohesive security and data lifecycle strategy can be daunting.

Gaps in Expertise

  • Cloud Proficiency: Managing a multi-cloud environment necessitates a high degree of expertise. It’s challenging to find professionals with comprehensive knowledge of multiple cloud platforms.
  • Learning Curve for IT and DevOps: The teams must familiarize themselves with the distinct methodologies, provisioning policies, and governance structures of each cloud provider. This can stretch resources and extend deployment timelines.

Cloud Cost

The financial implications of cross-cloud DR can be tricky to navigate for a variety of reasons. 

Cost Estimation Challenges

Operating across several cloud environments means managing and analyzing costs for each provider. This makes it labor-intensive to obtain a consolidated view of cloud expenditures.

Pricing Model Limitations

While pay-as-you-go pricing models are designed for scalability and flexibility, leveraging this across multiple clouds can be intricate. In a multi-cloud environment, expanding resources either up or down according to demand is more complicated and expensive.

Egress Fees

One cost that is often overlooked when it comes to multi-cloud strategies is the cloud egress fee. These are charges incurred when moving data out of one cloud provider’s system to another. Depending on the volume of data, these fees can quickly add up, impacting the overall cost efficiency of a multi-cloud DR strategy.

While cross-cloud disaster recovery has its undeniable merits, businesses must be aware of the associated complexities and costs. Balancing the benefits against these challenges requires careful planning, understanding of business requirements, and expert guidance.

Cross-Cloud Capabilities of N2WS

In an increasingly complex and diverse cloud landscape, businesses are constantly on the lookout for tools that simplify cross-cloud operations while ensuring data security and cost-effectiveness. N2WS is leading the charge in this domain with its latest cross-cloud capabilities, which we outline below.

Archival of AWS Backups into Azure

N2WS has introduced the pivotal feature of archiving AWS backups directly into Azure. This serves as a linchpin in businesses’ disaster recovery and data archival strategy, offering a bridge between the two leading cloud providers.

Enhanced Data Protection

Snapshot Archival

With N2WS, organizations can archive snapshots from AWS instances and volumes directly into an Azure storage account.

  • Data Lifecycle Management (DLM): The tool facilitates a seamless transition of DLM from AWS to Azure Repository. A key feature here is the incorporation of immutability as an added security layer.
  • Immutability: By leveraging Azure’s Lease Blob, the original data can be rendered immutable for a predetermined period, ensuring its integrity and protection against alterations.

Comprehensive Backup Management

N2WS’ approach to AWS backup management is robust and holistic.

  • Automated Transition: AWS backups are first moved to Azure storage, following which they are transitioned to colder Azure storage tiers, and then rendered immutable.
  • User-Friendly Interface: This intricate process is seamlessly managed through N2WS’ centralized dashboard, offering businesses a single pane of glass to view and manage their backups.
  • Multi-Layered Security: Even if AWS is compromised, data remains safe in Azure. Beyond the inherent security of shifting to a different cloud provider, the added layer of data immutability ensures that potential hackers face an unbeatable challenge in accessing and altering data.

Meeting GRC Standards

N2WS’ cross-cloud capabilities allow businesses to meet stringent governance, risk, and compliance (GRC) requirements. Enterprises will increasingly need to store certain data sets across multiple clouds, and N2WS paves the way for this.

Cost Optimization

While neither AWS nor Azure levies ingress charges, businesses need to be wary of egress fees incurred with both platforms. For instance, transferring 500 GB out of Azure’s US East Region would cost $43.07, while the same operation out of AWS’ S3 would be $44.91. While this might seem like a marginal difference, it underscores the importance of understanding and optimizing cross-cloud operations.

Based on this cost structure, restoring data in Azure would be more cost-effective, highlighting the type of strategic decisions businesses can make with the insights provided by N2WS.

N2WS’ latest cross-cloud capabilities promise to revolutionize the way businesses view and manage their multi-cloud operations. By bridging the gap between AWS and Azure, N2WS offers multi-layered data protection, thereby positioning itself as an indispensable tool in the modern cloud toolkit.

Cloud computing has evolved over time through continuous innovation

Traditional disaster recovery methods within single cloud environments like AWS or Azure may have provided stability, but they also highlighted gaps from region-specific vulnerabilities. To address these gaps, cross-cloud disaster recovery emerges as the timely answer. This approach allows businesses to harness the combined strengths of multiple cloud providers, in turn boosting resilience and ensuring that operations are spread across different regions and platforms to reduce points of failure.

However, transitioning to a cross-cloud paradigm is not without its challenges. From the intricacies of multi-platform data management to the unpredictability of costs, there are certainly significant hurdles to navigate. Fortunately, N2WS is a solution designed to bridge these gaps.

By streamlining AWS backup archival into Azure and introducing robust features like data immutability, N2WS serves both as a protective shield and a cost-optimized solution for businesses. As the cloud landscape continues to evolve, tools like N2WS are pivotal for organizations aiming to remain resilient and forward-focused in the digital age.

If you’re eager to lead in the cross-cloud era, discover how N2WS can bolster your disaster recovery strategy, ensuring you’re equipped for the challenges and opportunities ahead.

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N2WS vs AWS Backup

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N2WS in comparison to AWS Backup, offers a single console to manage backups across accounts or clouds. Here is a stylized screenshot of the N2WS dashboard.