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It does not remove the risk from an attacker who compromises the account, console or API credentials used to manage the backup, because those remain reachable over the network." } }, { "@type": "Question", "name": "What is the shared responsibility model in cloud backup?", "acceptedAnswer": { "@type": "Answer", "text": "Cloud providers are typically responsible for the security of the underlying infrastructure, while the customer is responsible for configuring identity, access control, retention and monitoring correctly. A misconfigured or compromised customer identity is a customer-side failure even though the data sits in the provider's infrastructure." } }, { "@type": "Question", "name": "Why does egress cost matter for ransomware recovery?", "acceptedAnswer": { "@type": "Answer", "text": "Restoring a large volume of data out of a cloud provider after an incident can incur significant egress charges, in addition to the time taken to transfer that volume over available bandwidth. This can materially affect both the cost and the speed of recovery compared with a copy that does not require an internet transfer." } }, { "@type": "Question", "name": "Can a cloud provider account be deleted or locked out during an incident?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Billing disputes, terms of service actions, credential compromise or account-level attacks can all result in a customer losing access to their own cloud account, including backup data stored within it. This is a distinct risk from ransomware encryption but has a similar practical effect." } }, { "@type": "Question", "name": "Is offline storage slower to restore from than cloud backup?", "acceptedAnswer": { "@type": "Answer", "text": "It depends on the design. A poorly designed offline process, such as manual tape rotation, can be slow. A disk based offline copy with a scheduled, managed connection window can restore at local disk speed, which is not constrained by internet bandwidth in the way a large cloud restore is." } }, { "@type": "Question", "name": "What does data sovereignty mean for backup storage?", "acceptedAnswer": { "@type": "Answer", "text": "Data sovereignty concerns which country's laws and jurisdiction govern the physical location where data is stored. Cloud backup can involve replication across multiple regions or countries, which may not align with regulatory requirements. Offline storage held in a specific facility gives an organisation more direct control over the jurisdiction of its data." } }, { "@type": "Question", "name": "Where are Firevault's offline storage bunkers located?", "acceptedAnswer": { "@type": "Answer", "text": "Firevault operates internationally. European facilities, including the UK, are live now, with facilities in the United States and the Middle East planned next. Customers choose the jurisdiction in which their offline copy is held, rather than it being determined automatically by a provider's region." } }, { "@type": "Question", "name": "Does using offline storage mean giving up cloud backup?", "acceptedAnswer": { "@type": "Answer", "text": "No. The two models suit different needs. Cloud backup is well suited to fast, frequent, everyday recovery of individual files or systems. Offline storage is well suited to holding a recovery copy of last resort that is not exposed to the same identity and network risks as the rest of the estate." } }, { "@type": "Question", "name": "What happens if a cloud provider itself has an outage?", "acceptedAnswer": { "@type": "Answer", "text": "A regional or platform-wide outage can make backup data temporarily or, in rare cases, permanently unavailable, depending on the nature of the failure and the provider's own resilience design. An offline copy held independently of any single provider is not exposed to that provider's outage." } }, { "@type": "Question", "name": "Is API access a security risk for cloud backup?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Backup platforms are typically managed through an API or console that is reachable over the network. If credentials for that plane are compromised, an attacker can potentially alter retention settings, delete snapshots or exfiltrate data, which is why backup APIs are frequently targeted early in an intrusion." } }, { "@type": "Question", "name": "Which model is cheaper for long term retention?", "acceptedAnswer": { "@type": "Answer", "text": "Cost comparisons depend heavily on volume, retention period and provider pricing, including egress and API charges, so no single universal answer applies. Organisations should model their specific retention volume and expected restore frequency against both cost structures rather than relying on a general rule." } }, { "@type": "Question", "name": "Can offline storage and cloud backup be used together?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, and this is the most common resilient design. Cloud or on-premises backup handles frequent operational recovery, while an offline copy is retained as the last line of defence in case the operational tiers are also compromised or deleted." } } ] } ] --- Recent Breaches Breaches [2026 PowerSchool 62.4M records ](/learn/breaches)[2026 DISA Global Solutions 3.3M records ](/learn/breaches)[2026 Globe Life 850K records ](/learn/breaches)[2026 Lidl GB Customer contact data ](/learn/breaches)[2026 Asahi Group Production systems disrupted ](/learn/breaches)[2026 Kido International 8K records ](/learn/breaches)[2026 Collins Aerospace (RTX) Check-in and boarding disruptio... ](/learn/breaches)[2026 Jaguar Land Rover Production and IT systems disru... ](/learn/breaches)[2026 Peter Green Chilled Order and logistics data ](/learn/breaches)[2026 Adidas UK Customer contact details ](/learn/breaches)[2026 PowerSchool 62.4M records ](/learn/breaches)[2026 DISA Global Solutions 3.3M records ](/learn/breaches)[2026 Globe Life 850K records ](/learn/breaches)[2026 Lidl GB Customer contact data ](/learn/breaches)[2026 Asahi Group Production systems disrupted ](/learn/breaches)[2026 Kido International 8K records ](/learn/breaches)[2026 Collins Aerospace (RTX) Check-in and boarding disruptio... ](/learn/breaches)[2026 Jaguar Land Rover Production and IT systems disru... ](/learn/breaches)[2026 Peter Green Chilled Order and logistics data ](/learn/breaches)[2026 Adidas UK Customer contact details ](/learn/breaches) [View All →](/learn/breaches) [![Firevault - offline secure storage, physically disconnected from the internet](/assets/logo-color-DBVl0KCg.png)](/) Products Solutions [Why OSS](/why-oss) More [Help](/help)[Get started](/get-started) [Knowledge Vault](/learn/knowledge) Explainer Ransomware resilience # Offline Storage vs Cloud Backup for Ransomware Protection Cloud backup and offline storage are not competing answers to the same question. This explainer sets out the shared responsibility model, the economics of restore at scale, and where each approach genuinely belongs in a ransomware resilient design. ![Mark Fermor](/assets/mark-fermor-aWtKNSv7.jpg) Mark Fermor Director & Co-Founder, Firevault 25 November 2025 15 min read Share [](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection)[](https://twitter.com/intent/tweet?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection&text=Offline%20Storage%20vs%20Cloud%20Backup%20for%20Ransomware%20Protection%0A%0ACloud%20backup%20and%20offline%20storage%20are%20not%20competing%20answers%20to%20the%20same%20question.%20This%20explainer%20sets%20out%20the%20shared%20responsibility%20model%2C%20the%20economics%20of%20restore%20at%20scale%2C%20and%20where%20each%20approach%20genuinely%20belongs%20in%20a%20ransomware%20resilient%20design.)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection)[](mailto:?subject=Offline%20Storage%20vs%20Cloud%20Backup%20for%20Ransomware%20Protection&body=Cloud%20backup%20and%20offline%20storage%20are%20not%20competing%20answers%20to%20the%20same%20question.%20This%20explainer%20sets%20out%20the%20shared%20responsibility%20model%2C%20the%20economics%20of%20restore%20at%20scale%2C%20and%20where%20each%20approach%20genuinely%20belongs%20in%20a%20ransomware%20resilient%20design.%0A%0Ahttps%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection) ![Split representation of a cloud backup network path and a physically disconnected offline storage bunker](/assets/explainer-offline-vs-cloud-ransomware-Dq4Ns_az.jpg) Cloud backup and offline storage fail differently, which is exactly why a resilient design often uses both. Written by Mark Fermor, Co-Founder, Firevault Technical review Firevault architecture team First published 25 November 2025 Last reviewed 27 August 2026 Review cycle At least annually, or following material changes to NIST, NCSC or ISO guidance. How we built this explainer: This explainer draws on published cloud provider shared responsibility documentation, NIST and ISO guidance on storage security and data sovereignty, and CISA and NCSC ransomware guidance. No vendor pricing, percentages or incident statistics have been invented; cost and speed comparisons are described qualitatively unless a figure is independently sourced. **On this page**[Two different models of resilience](#definition)[The shared responsibility model](#shared-responsibility)[Credential and API-plane risk](#credential-risk)[Egress and restore economics](#egress-economics)[Restore speed at scale](#restore-speed)[Sovereignty and jurisdiction](#sovereignty)[Provider outage and account-level deletion](#outage-deletion)[Where each model genuinely belongs](#where-each-belongs)[Comparing the two models directly](#comparison)[A practical decision checklist](#checklist)[Limits and failure modes](#limits)[How Firevault applies these principles](#firevault)[The key takeaway](#takeaway) On this page 1. [Two different models of resilience](#definition) 2. [The shared responsibility model](#shared-responsibility) 3. [Credential and API-plane risk](#credential-risk) 4. [Egress and restore economics](#egress-economics) 5. [Restore speed at scale](#restore-speed) 6. [Sovereignty and jurisdiction](#sovereignty) 7. [Provider outage and account-level deletion](#outage-deletion) 8. [Where each model genuinely belongs](#where-each-belongs) 9. [Comparing the two models directly](#comparison) 10. [A practical decision checklist](#checklist) 11. [Limits and failure modes](#limits) 12. [How Firevault applies these principles](#firevault) 13. [The key takeaway](#takeaway) Offline storage and cloud backup are often presented as rivals, but they are better understood as two different answers to two different failure modes. Cloud backup is optimised for speed, convenience and frequent access. Offline storage is optimised for the scenario where speed and convenience have already been compromised, because the network and identity systems that make cloud backup convenient are the same systems an attacker has taken over. This explainer works through the shared responsibility model that governs cloud backup, the specific risks that arise from credential and API-plane compromise, the economics of restoring large volumes of data from cloud, data sovereignty considerations, and the practical scenarios where each model is the right tool. ## Two different models of resilience Cloud backup stores data on infrastructure owned and operated by a third party provider, accessed over the internet through an identity-gated console or API. Offline storage holds a copy on hardware that has no active network connection for most of its life, brought online only for scheduled, identity verified connection windows. Cloud backup Optimised for speed and convenience - Always reachable for frequent restores - Managed by provider infrastructure - Scales elastically with usage Depends on identity, network and provider integrity remaining intact. Offline storage Optimised for isolation and assurance - No network path while offline - Independent of production identity systems - Refreshed on a scheduled connection window Trades constant availability for a copy that shares no failure mode with the rest of the estate. Cloud backup and offline storage optimise for different properties. ## The shared responsibility model Every major cloud provider operates under a shared responsibility model. The provider is generally responsible for the security of the underlying infrastructure, physical facilities and hypervisor layer. The customer is responsible for configuring identity, access control, encryption keys, retention settings and monitoring correctly on top of that infrastructure. This division matters for ransomware resilience because most reported cloud backup failures are customer side failures within that model: a misconfigured retention policy, an over-privileged service account, or a set of credentials that were phished. NCSC's [cloud security guidance](https://www.ncsc.gov.uk/collection/cloud) sets out this division clearly and stresses that customers cannot outsource responsibility for identity and configuration to the provider. Provider responsibility Physical security, infrastructure availability, hypervisor and platform integrity. Customer responsibility Identity, access control, retention configuration, encryption key handling and monitoring. Where ransomware usually lands The customer side of the line, through compromised credentials or misconfiguration. ## Credential and API-plane risk Cloud backup is managed through a console or API, both of which are reachable over the network and gated by identity. This is what makes cloud backup convenient, and it is also the specific property that ransomware operators exploit. Phished credentials, stolen session tokens or an escalated service account can grant access to the same management plane a legitimate administrator uses. [NIST SP 1339](https://csrc.nist.gov/pubs/sp/1339/final) discusses cybersecurity considerations specific to cloud backup, including the risk that an attacker who compromises an account can reach backup configuration directly. Because the backup control plane and the production identity system are frequently linked, a compromise of one can extend to the other. ## Egress and restore economics Cloud providers typically charge for data transferred out of their platform, known as egress. Under normal operating conditions this is a modest, predictable cost, but during a full-scale recovery from a ransomware incident, an organisation may need to retrieve its entire backed-up estate in a short period. That combination of volume and urgency can produce a large, unplanned cost at exactly the point when budget flexibility is most constrained. Offline storage does not involve an internet transfer for a restore, because the recovery happens over a local or direct connection during a scheduled window. This does not make offline storage free, but it removes a specific and variable cost that only appears at the worst possible time with a cloud based restore. ## Restore speed at scale Restoring a small number of files from cloud backup is typically fast. Restoring an entire estate is a different problem, because the transfer is bound by available internet bandwidth, which is usually far lower than the throughput of a local storage connection. A large restore over a constrained internet link can take substantially longer than the same volume of data moving over a direct local connection. Small restore Cloud backup Fast for individual files or small volumes; bandwidth is rarely the bottleneck. Full estate restore Cloud backup Bound by available internet bandwidth and provider throughput limits, which can extend recovery time significantly. Full estate restore Offline storage Runs over a local or direct connection during a scheduled window, bound by disk and receiving system throughput rather than internet bandwidth. Restore throughput depends on the path the data has to travel, not just the storage medium itself. ## Sovereignty and jurisdiction Data sovereignty concerns which country's laws govern data based on where it is physically stored. Cloud providers often replicate data across multiple regions for resilience, which can create uncertainty about exactly where a given copy resides at a given time, and which legal jurisdiction applies to it. Offline storage held in a specific, named facility gives an organisation direct visibility of, and control over, the jurisdiction in which its data sits. Firevault operates its Offline Secure Storage bunkers internationally, with European facilities, including the UK, live now, and facilities in the United States and the Middle East planned next. The jurisdiction in which a customer's copy is held is chosen by the customer, rather than being determined automatically by a cloud region assignment. ## Provider outage and account-level deletion Cloud backup depends on the provider's own platform remaining available and the customer's account remaining accessible. Both assumptions can fail independently of ransomware. Regional or platform outages have, on occasion, made services temporarily unavailable across affected customers. Separately, billing disputes, terms of service enforcement or account-level compromise can result in a customer losing access to its own account, including any backup data held within it. Neither scenario is a ransomware attack in the conventional sense, but the practical effect on an organisation, being unable to reach its own recovery data, is similar. An offline copy held outside any single provider's account structure is not exposed to either failure mode. ## Where each model genuinely belongs Neither model is universally superior. Cloud backup is well suited to frequent, granular recovery needs: restoring a single file, rolling back a recent change, or recovering a system shortly after a non-catastrophic failure. Its convenience and elasticity are genuine advantages for this kind of everyday use. Offline storage is well suited to a narrower, more specific purpose: holding a clean, verified copy that shares no failure mode with production, to be used when the faster tiers have themselves been compromised, deleted or made unreachable. It is not designed to replace day to day backup operations. ## Comparing the two models directly Factor Cloud backup Offline storage Network reachability Always reachable via console or API No network path while offline Primary risk Credential and identity compromise Refresh cadence and connection window discipline Restore at scale Bound by internet bandwidth and egress cost Bound by local disk and receiving throughput Jurisdiction control Often determined by provider region and replication Chosen directly by the customer for the facility used Outage exposure Exposed to provider platform and account level failures Independent of any single provider's platform or account Best suited to Frequent, granular, everyday recovery Recovery copy of last resort A direct comparison across the factors covered in this explainer. ## A practical decision checklist - Have you mapped which recovery scenarios depend on cloud backup identity remaining intact? - Do you know the egress cost of a full estate restore under your current cloud contract? - Have you tested restore time at full scale, not just for individual files? - Is at least one recovery copy held outside your primary cloud provider's account structure? - Do you know, precisely, which jurisdiction each copy of your data is held in? - Would an account lockout or billing dispute leave you without access to any backup copy? ## Limits and failure modes Offline storage is not immune to failure. If refresh cycles are infrequent, the recovery point can lag behind business tolerance. If connection windows are poorly controlled, they can themselves become a reachable surface. Cloud backup is not inherently insecure either; many of its risks are addressed through disciplined identity hygiene, monitoring and correctly configured retention. The practical failure mode to avoid is treating either model as sufficient on its own for every recovery scenario an organisation might face. ## How Firevault applies these principles Firevault provides Offline Secure Storage® as the offline half of a layered recovery strategy, designed to sit alongside an organisation's existing cloud or on-premises backup rather than replace it. The storage has no network interface while offline, so the credential and API-plane risks described in this explainer do not apply to it during that period. Firevault operates bunkers internationally. European facilities, including the UK, are live now, with the United States and the Middle East planned next, and the jurisdiction in which a customer's copy is held is chosen by the customer. Connection windows are scheduled and identity verified under the Disconnect to Protect® approach, with a tamper evident record of every connection managed through Firevault Control, separately from production identity systems. Key takeaway ## The question is not which model wins, but which risk each model actually removes Cloud backup and offline storage fail in different ways. Cloud backup is exposed to identity compromise, API abuse, egress cost at scale and provider or account-level failure. Offline storage removes network reachability but depends on disciplined refresh cycles and well managed connection windows. A resilient design typically uses cloud or on-premises backup for fast, frequent, everyday recovery, and an offline copy as the recovery point of last resort that does not share the same failure modes as everything else in the estate. Questions ## Frequently Asked Questions Straight answers on how Offline Secure Storage® behaves in practice. ### Is cloud backup safe from ransomware? ### What is the shared responsibility model in cloud backup? ### Why does egress cost matter for ransomware recovery? ### Can a cloud provider account be deleted or locked out during an incident? ### Is offline storage slower to restore from than cloud backup? ### What does data sovereignty mean for backup storage? ### Where are Firevault's offline storage bunkers located? ### Does using offline storage mean giving up cloud backup? ### What happens if a cloud provider itself has an outage? ### Is API access a security risk for cloud backup? ### Which model is cheaper for long term retention? ### Can offline storage and cloud backup be used together? ## Sources and further reading - [NIST SP 800-209, Security Guidelines for Storage Infrastructure](https://csrc.nist.gov/pubs/sp/800/209/final) Guidance on securing storage systems, including access control, encryption and the boundaries of provider responsibility. - [ISO/IEC 27040, Storage Security](https://www.iso.org/standard/68240.html) International standard covering storage security controls, including considerations for offline and removable media. - [CISA, StopRansomware Guide](https://www.cisa.gov/stopransomware) Recommends offline, encrypted backup copies in addition to cloud or immutable backup tiers. - [NCSC, Cloud Security Guidance and Shared Responsibility Principles](https://www.ncsc.gov.uk/collection/cloud) UK guidance on the division of security responsibility between cloud providers and customers. - [NIST SP 1339, Cybersecurity Considerations for Cloud Backup](https://csrc.nist.gov/pubs/sp/1339/final) Considerations for cloud backup resilience, including identity risk and recovery planning. Related Firevault guides [Physical air gap storage for ransomware protection](/learn/physical-air-gap-ransomware-protection) [The 3-2-1-1-0 rule explained](/learn/3-2-1-1-0-whitepaper) [What is Offline Secure Storage](/how-it-works/offline-secure-storage) About the author ![Mark Fermor](/assets/mark-fermor-aWtKNSv7.jpg) ### Mark Fermor [](https://www.linkedin.com/in/mfermor) Director & Co-Founder Co-founder of Firevault, focused on offline secure storage and protecting individuals and businesses from fraud, fines, loss and damage. Speaker, owner and advisor. Share this explainer Share [](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection)[](https://twitter.com/intent/tweet?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection&text=Offline%20Storage%20vs%20Cloud%20Backup%20for%20Ransomware%20Protection%0A%0ACloud%20backup%20and%20offline%20storage%20are%20not%20competing%20answers%20to%20the%20same%20question.%20This%20explainer%20sets%20out%20the%20shared%20responsibility%20model%2C%20the%20economics%20of%20restore%20at%20scale%2C%20and%20where%20each%20approach%20genuinely%20belongs%20in%20a%20ransomware%20resilient%20design.)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection)[](mailto:?subject=Offline%20Storage%20vs%20Cloud%20Backup%20for%20Ransomware%20Protection&body=Cloud%20backup%20and%20offline%20storage%20are%20not%20competing%20answers%20to%20the%20same%20question.%20This%20explainer%20sets%20out%20the%20shared%20responsibility%20model%2C%20the%20economics%20of%20restore%20at%20scale%2C%20and%20where%20each%20approach%20genuinely%20belongs%20in%20a%20ransomware%20resilient%20design.%0A%0Ahttps%3A%2F%2Ffire-vault.com%2Flearn%2Foffline-vs-cloud-ransomware-protection) The Firevault view**Offline Secure Storage® keeps a clean copy beyond the reach of an attacker.**[Why #OSS →](/why-oss) Control systems and access**Cut the physical paths attackers and third parties depend on.**[Explore Control →](/solutions/control) Get started**Get started, or talk to a member of the team.**[Get started →](/get-started)