RSMUS.comWhat are immutable backups?
Immutable backups are backup copies that cannot be modified, deleted, encrypted or overwritten for a defined period of time. Once created, the backup remains protected until the retention period expires, helping organizations preserve clean recovery points even if attackers gain access to their environment.
As ransomware attacks continue to evolve, many organizations are adopting immutable backups as part of a broader managed IT services strategy that incorporates cybersecurity, infrastructure management and long-term operational resilience. RSM helps organizations strengthen cyber resilience through integrated managed IT, security and advisory services designed to improve recovery readiness and reduce business risk.
Why are immutable backups becoming more important?
The role of backups has changed significantly over the past several years.
Historically, backups were primarily designed to recover from hardware failures, accidental deletion and operational disruptions. Today, they are an essential component of cybersecurity, business continuity and disaster recovery.
Many ransomware groups now target backup repositories before attacking production systems. Their objective is to eliminate data recovery options and increase pressure on organizations to pay a ransom. RSM professionals involved in cyber recovery efforts have observed that organizations frequently discover backup misconfigurations and recovery gaps only after an incident occurs.
Organizations evaluating immutable backups often begin by reviewing their broader cybersecurity strategy and managed security services capabilities to determine whether their recovery controls align with today’s threat landscape.
As a result, business leaders are asking a new question:
“If our organization experiences a ransomware attack, will our backups still be available and recoverable?”
How do immutable backups help protect against ransomware?
Immutable backups help strengthen ransomware protection by ensuring that backup data cannot be modified or deleted during a defined retention period.
Modern ransomware attacks often focus on backup infrastructure because attackers understand that recovery is significantly more difficult when backup data is compromised. By protecting critical recovery points, immutable backups improve ransomware recovery capabilities and help organizations maintain access to trusted backup copies.
While immutable backups do not prevent cyberattacks, they improve recovery confidence, support incident response efforts and reduce the operational impact of a ransomware event. Organizations that combine immutable backups with security monitoring, endpoint protection and response planning are often better positioned to recover from cyber incidents.
Why recovery readiness matters more than ever
Cybersecurity conversations often focus on preventing attacks. Increasingly, organizations are recognizing that recovery readiness is equally important.
Boards, executives and cyber insurers want confidence that critical business systems can be restored quickly following a cyber event. This focus on recovery has elevated discussions around business resilience, operational resilience and cyber resilience strategy.
Organizations that regularly assess their business continuity planning, conduct recovery testing and evaluate disaster recovery capabilities are often better positioned to restore operations quickly and minimize business disruption. RSM’s advisory and managed services teams frequently help clients align recovery strategies with business requirements and risk objectives.
For many organizations, recovery preparedness is no longer just an IT objective—it is a business objective that directly impacts revenue, customer trust, regulatory compliance and operational continuity.
What is the difference between traditional backups and immutable backups?
Traditional backups create copies of data that can later be restored if information is lost, corrupted or deleted. However, many traditional backup environments still allow authorized users—or compromised administrative accounts—to alter or remove backup data.
Immutable backups provide an additional layer of backup security by preventing changes to stored backup copies during the retention period.
This distinction is particularly important when evaluating cyber recovery capabilities. During a ransomware attack, the ability to restore from a known-good backup can significantly affect recovery timelines, business continuity outcomes and the overall effectiveness of incident response efforts.
Should immutable backups be on-premises or in the cloud?
Organizations evaluating immutable backups typically consider two deployment approaches.
Local immutable backups
Local immutable repositories provide direct control over backup infrastructure and often support faster recovery times because data remains closer to production systems. Organizations frequently choose this approach when recovery speed is a primary requirement or when operational policies require greater infrastructure control.
Cloud immutable backups
Cloud-based immutable storage offers scalability and simplified deployment without requiring additional on-premises infrastructure.
Many organizations leverage cloud immutability as part of a broader managed cloud services strategy that incorporates business continuity, disaster recovery and infrastructure modernization. RSM’s cloud services support organizations operating across public, private and hybrid cloud environments while balancing resilience, governance and security requirements.
The optimal approach depends on factors such as recovery objectives, retention requirements, infrastructure architecture, budget and regulatory considerations.
Are immutable backups required for cyber insurance?
Cyber insurance requirements vary by carrier and policy, but many organizations are seeing increased scrutiny around backup practices, recovery testing, resilience controls and cyber risk management.
Organizations preparing for policy renewals often combine discussions around immutable backups with broader cyber resilience assessments and security assessments to better understand recovery risks and operational exposure.
While immutable backups may not be explicitly required by every insurer, they are increasingly part of broader conversations around recovery preparedness and cyber resilience.
Are immutable backups enough to protect an organization?
No.
Immutable backups should be viewed as one component of a broader cybersecurity strategy.
The most resilient organizations combine secure backups with managed security services, security monitoring, identity and access management, endpoint protection, recovery testing, disaster recovery planning and ongoing governance. Managed Microsoft 365 services, technology advisory services and managed IT services can all play a role in supporting recovery readiness and operational resilience.
Cyber resilience requires a layered approach that addresses prevention, detection, response and recovery—not just one of those areas.
Signs it may be time to evaluate immutable backups
Organizations often begin evaluating immutable backups when cyber insurance requirements change, leadership requests greater confidence in recovery preparedness, recovery testing identifies gaps, backup infrastructure modernization initiatives begin, or regulatory expectations increase.
For many organizations, the decision is not simply about implementing new technology. It is about improving business continuity, reducing cyber risk, strengthening data protection and increasing confidence in their ability to recover from disruption.
Organizations facing rapid growth, mergers and acquisitions, technology modernization initiatives or increasing compliance demands often use these milestones as opportunities to review their backup and recovery strategy.
Frequently Asked Questions
What are immutable backups?
Immutable backups are backup copies that cannot be modified, deleted or overwritten for a defined period of time. This protection helps preserve recovery data from ransomware attacks, accidental deletion and unauthorized changes.
Do immutable backups stop ransomware attacks?
No. Immutable backups do not prevent an attack from occurring. Their purpose is to improve recovery outcomes by protecting backup data from being altered or destroyed.
Why are immutable backups becoming more important?
Ransomware groups increasingly target backup repositories before launching attacks. Immutable backups help organizations maintain access to protected recovery points even when parts of the environment have been compromised.
Are immutable backups required for cyber insurance?
Requirements vary by insurer, but many organizations are seeing increased focus on backup security, recovery testing and resilience controls during underwriting and renewal discussions.
Can immutable backups be deployed on-premises?
Yes. Many organizations deploy immutable backup repositories within their own infrastructure to support faster recovery and greater operational control.
Can immutable backups be stored in the cloud?
Yes. Many cloud providers support immutable storage options that help protect backup data from modification or deletion while supporting broader disaster recovery and business continuity objectives.
Will immutable backups increase costs?
They can. Additional storage consumption, new infrastructure and retention requirements may increase costs. However, many organizations view these investments as part of their broader cyber resilience and risk management strategy.
Does having backups mean we’re protected?
Not necessarily. One of the most common misconceptions in cybersecurity is that having a backup automatically means recoverability is assured. Recovery success depends on backup quality, protection mechanisms, testing processes and overall recovery planning. RSM recovery teams have noted that organizations frequently encounter backup misconfigurations and implementation gaps during actual recovery efforts.
What is the difference between backup and recovery readiness?
Backups are a technology capability. Recovery readiness is an organizational capability that includes backup protection, disaster recovery planning, recovery testing, governance and documented recovery procedures. Organizations should evaluate both when assessing cyber resilience.
How often should backups be tested?
The appropriate testing schedule varies by organization, industry, risk profile and recovery requirements. However, regular recovery testing is critical to validating that backup and recovery processes work as expected and when needed.
Related resources
Organizations exploring immutable backups may also find value in related RSM capabilities and insights, including:
- Managed IT services
- Managed security services
- Managed cloud services
- Technology advisory services
- Microsoft 365 managed services
These areas often work together to strengthen operational resilience, improve recovery outcomes and reduce cyber risk.
How RSM can help
Every organization has different recovery objectives, compliance requirements and operational risks.
RSM helps organizations assess backup maturity, evaluate recovery readiness and identify opportunities to strengthen business resilience through managed IT services, managed security services, managed cloud services, technology advisory and cybersecurity expertise. Through a combination of advisory-led guidance, infrastructure experience and managed services, RSM helps organizations reduce risk, improve recovery outcomes and strengthen cyber resilience.
Evaluate whether immutable backups are the right fit for your recovery strategy
The most important question is not whether you have backups. It is whether those backups will still be available when you need them most.
As ransomware threats continue to evolve, recovery readiness is becoming just as important as prevention. If you would like an independent perspective on your current backup and recovery strategy, RSM can help assess your environment, evaluate immutable backup options, review disaster recovery and business continuity capabilities, and identify opportunities to strengthen your organization’s cyber resilience roadmap.
Evaluate whether immutable backups are the right fit for your recovery strategy. Connect with an RSM advisor to discuss your options.
Ben Ford
Ben Ford is the Manager of the RSM Managed Backup Offering and brings more than 12 years of experience in backup and recovery solutions. He has spent the last 9 years specializing in Veeam technologies, with expertise spanning managed backup services, disaster recovery, business continuity, and data recovery. Ben holds a Bachelor's degree in Management Information Systems and an Associate's degree in Electronic Crime, combining technical expertise with business-focused leadership to help organizations build resilient and secure data protection strategies.