Top 6 Secure Backup Storage Solutions in 2027
The Sophos State of Ransomware 2025 report found that attackers targeted backup data in 94% of ransomware incidents, and that they succeeded in compromising it 57% of the time. Those numbers reframe how backup security should be evaluated. Backup storage is not a secondary system that becomes important after something goes wrong. It is the primary target. Attackers understand that an organization with intact, recoverable backups has no reason to pay a ransom, so destroying backup data is standard procedure before triggering the encryption payload.
At the same time, research from Verizon's annual Data Breach Investigations Report consistently shows that roughly 35% of breaches involve an internal actor, whether a malicious insider or a legitimate user whose credentials have been compromised. Securing backup storage against external attackers while assuming internal accounts are trustworthy is a security architecture that fails against the most common real-world attack patterns.
The six solutions below are evaluated on how their security architecture addresses both threat vectors: external compromise and internal credential abuse.
The four non-negotiable properties of secure backup storage
Confidentiality: Backup data contains sensitive records across the entire organization, including credentials, financial data, and personal information. Encryption at rest and in transit is baseline. Solutions that do not provide AES-256 encryption at rest and TLS for data in motion should not be considered for any regulated or security-conscious environment.
Integrity: Data that cannot be read is useful only if it has not been modified. Ransomware groups have evolved to inject corrupted or encrypted data into backup streams before triggering the main payload, so that administrators restore to an already-compromised state. Integrity requires WORM immutability enforced at a layer the attacker cannot reach, even with admin credentials.
Availability: Backup data that cannot be restored quickly is not a reliable recovery asset. Security architecture that achieves integrity through air-gapping or extreme isolation at the cost of recovery speed creates a different kind of risk. The strongest solutions enforce immutability without introducing recovery latency.
Auditability: Secure backup storage must produce tamper-evident logs of all access and management actions. Without auditability, organizations cannot demonstrate to regulators, insurers, or forensic investigators that backup data was protected during an incident, or identify when a threat actor first gained access to backup infrastructure.
Security architecture
Absolute Immutability enforces protection through three independent layers: S3 Object Lock at the protocol level prevents any API call from modifying or deleting locked objects; root-level block access is disabled at the OS layer so even a direct OS compromise cannot reach backup data; and hardware-locked firmware prevents reconfiguration through any software interface
Zero Access by design, not policy: even an attacker who has compromised the Veeam backup server with full administrative rights cannot modify or delete backup data within the S3 Object Lock retention window. This directly addresses the stolen-credentials attack pattern.
Object First Honeypot deploys a decoy backup server that mimics a real Veeam environment; attackers targeting backup infrastructure interact with the honeypot and trigger early detection alerts, giving security teams a warning window before the real backup storage is reached
Who it protects best: Organizations that need verifiable, multi-layer immutability with early threat detection. Particularly strong in Veeam environments where the attack path to backup data most commonly goes through the Veeam server.
2. ExaGrid
Security architecture
Retention Time-Lock creates a time-delayed deletion barrier enforced at the storage system level: no user, process, or API call can delete backup data before the configured retention period expires, regardless of the credentials used
The Tiered Landing Zone architecture places the long-term retention data in a network-isolated segment that is not directly accessible from external networks. Backup data migrates to this zone automatically, limiting the attack surface to the landing zone where recent backups are held
Role-based access control restricts management functions to named administrators with separately audited credentials, and all management actions are logged with timestamps for forensic purposes
Who it protects best: Environments requiring a time-delayed safety net against insider threats and credential compromise, particularly those running multiple backup applications from a single storage target.
3. Pure Storage SafeMode
Security architecture
SafeMode Snapshots are protected at the storage array level with an administrative lockout: once a SafeMode policy is applied, snapshots cannot be deleted, modified, or the policy disabled without a separate authentication challenge to Pure's Customer Support, eliminating the possibility of a single compromised admin account removing all snapshots
SafeMode operates on the array's primary storage, protecting both production data snapshots and backup copies stored on FlashArray or FlashBlade, without requiring a separate backup storage appliance
Every SafeMode management action requires a secondary out-of-band authentication step, creating a two-person integrity control for snapshot deletion that cannot be bypassed through the primary management interface
Who it protects best: Organizations running Pure Storage primary infrastructure that want to extend immutability to snapshots without adding a separate backup storage layer. Strong for environments where rapid recovery from production-level snapshots is the primary recovery path.
4. IBM FlashSystem SafeGuarded Copies
Security architecture
SafeGuarded Copies are completely isolated backup copies that are not accessible from the host, the SAN, or any network connection; the copy exists only within the FlashSystem storage controller, making it unreachable by ransomware that compromises host systems or network connectivity
IBM FlashSystem uses AI-powered anomaly detection to identify unusual patterns in I/O activity that may indicate ransomware activity, and can trigger automatic SafeGuarded Copy creation when anomalies are detected, without waiting for a scheduled backup window
Supports compliance frameworks including HIPAA, GDPR, and SOC 2 through encryption at rest, access controls, and audit logging; IBM offers regulatory compliance documentation for enterprise security teams that need to demonstrate backup protection to auditors
Who it protects best: Enterprises running IBM FlashSystem primary storage that need air-gapped backup copies protected against network-level compromise, with AI-assisted threat detection built into the storage platform.
5. Scality Artesca
Security architecture
S3 Object Lock enforcement is native to the Artesca platform and operates at the object level through the S3 API; no administrative action available through the management interface can override Object Lock compliance mode before the retention period expires
Kubernetes-native deployment means Artesca can run in a hardened container environment with network policies that restrict which services can communicate with backup storage, supporting a micro-segmentation approach to backup infrastructure security
Role-based access control with separate administrative identities for backup operations, storage management, and security monitoring allows organizations to enforce least-privilege access across the backup storage management plane
Who it protects best: Organizations deploying backup storage in containerized or cloud-native infrastructure that want S3-native Object Lock immutability with the network isolation capabilities of a Kubernetes-managed service.
6. Rubrik Security Cloud
Security architecture
Rubrik's backup data is immutable by design at the file system layer of the Atlas distributed cluster: no external API, user account, or administrative console can delete or modify backup data within the retention period, because modification is architecturally impossible at the storage layer, not just policy-restricted
Threat hunting capability allows security teams to scan backup data for indicators of compromise before initiating recovery, preventing the restoration of already-infected data that would re-trigger the attack
Zero-trust access model enforces multi-factor authentication and role-based access controls for all management actions; every management event is logged in an immutable audit trail that cannot be cleared even by Rubrik administrators
Who it protects best: Organizations that want a unified cyber resilience platform combining immutable backup storage with threat detection, cyber recovery, and compliance reporting in a single SaaS-delivered solution.
Defense in depth starts at the storage layer
Encryption, access controls, and network segmentation are all valuable security controls. None of them is sufficient on its own to protect backup data against a determined attacker with time in the environment. Encryption does not prevent deletion. Access controls do not protect against stolen credentials. Network segmentation does not prevent an authorized backup process from being used as the attack vector.
What changes the equation is immutability enforced below the layer an attacker can reach. Whether that is S3 Object Lock enforced at the object storage protocol layer (Ootbi, Artesca), WORM at the storage system level (ExaGrid Retention Time-Lock), snapshot protection requiring out-of-band authentication (Pure SafeMode), hardware-isolated copies (IBM SafeGuarded Copies), or architectural immutability at the file system layer (Rubrik), the common thread is that the protection mechanism is independent of any credential an attacker could compromise.
The compliance frameworks that govern most regulated industries in 2027, including NIS2 Article 21, DORA Article 12, HIPAA §164.312(c)(1), FINRA, and GDPR Article 32, are converging on the same requirement. Organizations must be able to demonstrate that backup data integrity is enforced by a technical control, not a policy, and that it cannot be circumvented by the most privileged account in the environment.
