--- title: "Air Gap vs Immutable Backup for Ransomware Protection" description: "How a physical air gap differs from immutable cloud backup, where each fails, and why the two belong together in a modern ransomware resistant strategy." lang: en-GB json-ld: | [ { "@context": "https://schema.org", "@type": "Organization", "@id": "https://fire-vault.com/#organization", "name": "Firevault", "legalName": "Firevault Limited", "url": "https://fire-vault.com", "logo": { "@type": "ImageObject", "url": "https://fire-vault.com/logo.png", "width": 200, "height": 60 }, "foundingDate": "2025-03", "description": "Firevault has rewritten the rules for data protection & storage via its offline secure storage (OSS) platform, for users to vault everything that matters.", "address": { "@type": "PostalAddress", "addressCountry": "GB", "addressLocality": "United Kingdom" }, "contactPoint": [ { "@type": "ContactPoint", "contactType": "customer service", "email": "hello@fire-vault.com", "availableLanguage": "English", "areaServed": "GB" } ], "sameAs": [ "https://www.linkedin.com/company/firevault", "https://x.com/firevaultuk" ], "slogan": "Disconnect to Protect", "knowsAbout": [ "Offline Secure Storage", "Physical Air Gap Data Protection", "Ransomware Protection", "Data Sovereignty", "GDPR Compliance", "NIS2 Compliance" ] }, { "@context": "https://schema.org", "@type": "WebSite", "@id": "https://fire-vault.com/#website", "name": "Firevault", "alternateName": [ "Firevault", "Firevault UK", "Firevault Limited" ], "url": "https://fire-vault.com", "publisher": { "@id": "https://fire-vault.com/#organization" }, "inLanguage": "en-GB", "description": "Firevault has rewritten the rules for data protection & storage via its offline secure storage (OSS) platform, for users to vault everything that matters.", "potentialAction": { "@type": "SearchAction", "target": { "@type": "EntryPoint", "urlTemplate": "https://fire-vault.com/learn?q={search_term_string}" }, "query-input": "required name=search_term_string" } }, { "@context": "https://schema.org", "@type": "WebPage", "@id": "https://fire-vault.com/learn/air-gap-vs-immutable-backup#webpage", "url": "https://fire-vault.com/learn/air-gap-vs-immutable-backup", "name": "Air Gap vs Immutable Backup for Ransomware Protection", "description": "How a physical air gap differs from immutable cloud backup, where each fails, and why the two belong together in a modern ransomware resistant strategy.", "isPartOf": { "@id": "https://fire-vault.com/#website" }, "about": { "@id": "https://fire-vault.com/#organization" }, "primaryImageOfPage": { "@type": "ImageObject", "url": "https://fire-vault.com/images/og/og-base-learn.jpg" }, "inLanguage": "en-GB", "breadcrumb": { "@id": "https://fire-vault.com/learn/air-gap-vs-immutable-backup#breadcrumb" } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "@id": "https://fire-vault.com/learn/air-gap-vs-immutable-backup#breadcrumb", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://fire-vault.com" }, { "@type": "ListItem", "position": 2, "name": "Learn", "item": "https://fire-vault.com/learn" }, { "@type": "ListItem", "position": 3, "name": "Air Gap vs Immutable Backup for Ransomware Protection", "item": "https://fire-vault.com/learn/air-gap-vs-immutable-backup" } ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Is immutable backup an air gap?", "acceptedAnswer": { "@type": "Answer", "text": "No. Immutable backup is a logical control on a network that remains reachable. An air gap means there is no network path to the data. The two are often marketed as equivalent, but they defeat different classes of attacker and should be treated as complementary layers rather than substitutes." } }, { "@type": "Question", "name": "Which is more resistant to ransomware, immutable or air gap?", "acceptedAnswer": { "@type": "Answer", "text": "A physical air gap is more resistant because it removes the prerequisite that remote ransomware needs, which is a reachable target. Immutable backup remains reachable and depends on identity and configuration holding under attack. In real incidents, attackers have repeatedly weakened immutability from a compromised console before encrypting production." } }, { "@type": "Question", "name": "Do I still need immutable cloud backup if I have a physical air gap?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, in most cases. Immutable cloud backup gives you fast operational recovery from everyday incidents. The air gap gives you the clean gold copy of last resort. Firevault Offline Secure Storage is designed to sit alongside your existing immutable platform, not to replace it." } }, { "@type": "Question", "name": "Can attackers modify data on a physical air gap?", "acceptedAnswer": { "@type": "Answer", "text": "Not remotely. While the storage is offline it has no network path, so no remote command can reach it. During scheduled, identity verified connection windows the write path is controlled and logged on a separate management plane. The remote attacker prerequisite never applies." } }, { "@type": "Question", "name": "How does an air gap satisfy the 3-2-1-1-0 rule that immutable alone does not?", "acceptedAnswer": { "@type": "Answer", "text": "The 3-2-1-1-0 rule adds one offline copy and zero recovery errors to the classic 3-2-1. Immutable cloud storage is still an online copy, so it counts toward the 3 and the offsite 1, but not the offline 1. A physical air gap is designed specifically to be that offline copy." } } ] } ] --- Recent Breaches Breaches [2026 PowerSchool 62.4M records ](https://www.bleepingcomputer.com)[2026 DISA Global Solutions 3.3M records ](https://techcrunch.com)[2026 Globe Life 850K records ](https://www.securityweek.com)[2026 Lidl GB Customer contact data ](https://www.theguardian.com/business/2026/jun/11/lidl-gb-third-party-data-breach)[2026 Asahi Group Production systems disrupted ](https://www.reuters.com/technology/cybersecurity/asahi-says-cyberattack-disrupted-operations-japan-2025-09-29/)[2026 Kido International 8K records ](https://www.bbc.co.uk/news/articles/c623d7v0e5xo)[2026 Collins Aerospace (RTX) Check-in and boarding disruptio... ](https://www.bbc.co.uk/news/articles/c789e7l1z7po)[2026 Jaguar Land Rover Production and IT systems disru... ](https://www.bbc.co.uk/news/articles/cx2gx8p3rzeo)[2026 Peter Green Chilled Order and logistics data ](https://www.bbc.co.uk/news/articles/c0k7yy8n3g5o)[2026 Adidas UK Customer contact details ](https://www.bbc.co.uk/news/articles/c78jkev1el2o)[2026 PowerSchool 62.4M records ](https://www.bleepingcomputer.com)[2026 DISA Global Solutions 3.3M records ](https://techcrunch.com)[2026 Globe Life 850K records ](https://www.securityweek.com)[2026 Lidl GB Customer contact data ](https://www.theguardian.com/business/2026/jun/11/lidl-gb-third-party-data-breach)[2026 Asahi Group Production systems disrupted ](https://www.reuters.com/technology/cybersecurity/asahi-says-cyberattack-disrupted-operations-japan-2025-09-29/)[2026 Kido International 8K records ](https://www.bbc.co.uk/news/articles/c623d7v0e5xo)[2026 Collins Aerospace (RTX) Check-in and boarding disruptio... ](https://www.bbc.co.uk/news/articles/c789e7l1z7po)[2026 Jaguar Land Rover Production and IT systems disru... ](https://www.bbc.co.uk/news/articles/cx2gx8p3rzeo)[2026 Peter Green Chilled Order and logistics data ](https://www.bbc.co.uk/news/articles/c0k7yy8n3g5o)[2026 Adidas UK Customer contact details ](https://www.bbc.co.uk/news/articles/c78jkev1el2o) [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) Why OSS # Air Gap vs Immutable Backup Immutable is a logical control on a reachable network. A physical air gap has no network at all. Here is how the two differ, and why the modern answer is both, layered. Book a demo ![Corridor of offline storage racks inside a Firevault bunker](/assets/hero-square-bunker-BC9Flanh.jpg) R3 Definitions ## Two Different Threat Models Immutable backup and physical air gap defeat different classes of attacker. Start with clean definitions. 01 A logical control on a reachable network ### Immutable backup Immutable backup means the data cannot be altered or deleted for a defined retention window. Object Lock, WORM and hardened repositories are the common patterns. They live on hardware that remains connected to the network and defended by identity and policy. - Object Lock, WORM, retention policy - Reachable over the network - Enforced by identity and configuration 02 No network path at Layer 1 ### Physical air gap A physical air gap means the storage hardware has no active network connection when offline. There is no IP address, no listening service and no API to authenticate to. The boundary is physics, not policy, and it holds even when an attacker has domain admin. - No NIC, no IP, no listener - Out of band switching only - Independent of identity systems Where they diverge ## What Breaks, What Proves and How They Fit Together The three questions that decide which layer belongs where in your ransomware resistant architecture. 01 Where each model fails ### What breaks the guarantee Immutable backup fails when an attacker reaches a privileged cloud account, changes retention, disables versioning or waits out the lock window. A physical air gap fails only when an attacker gains physical presence at the storage, which is outside the scope of remote ransomware. - Immutable: admin, tokens, clock skew - Air gap: physical access only - Different threat models entirely 02 Audit trails and chain of custody ### How each proves integrity Immutable backup relies on the same cloud plane it is defending. Its own audit log lives next to the data. A physical air gap logs every connection and disconnection on a separate management plane, giving investigators, insurers and regulators a stable, tamper evident record. - Immutable: same plane audit - Air gap: out of band audit - Air gap survives control plane compromise 03 Layered, not replacement ### How they fit together Most estates keep immutable cloud backup for fast operational recovery and add a physical air gap as the gold copy of last resort. Immutable handles the accident, the deletion and the small scale ransomware. The air gap handles the day the rest of the estate is on fire. - Immutable for hot recovery - Air gap as gold copy - Together they satisfy 3-2-1-1-0 Read the pillar guide, or continue with the backup rule that ties them together. [Physical air gap storage for ransomware protection](/learn/physical-air-gap-ransomware-protection) [The 3-2-1-1-0 backup rule](/learn/3-2-1-1-0-backup-rule) [What is Offline Secure Storage](/offline-secure-storage) Questions ## Air Gap vs Immutable Backup, Common Questions Straight answers on how Offline Secure Storage® behaves in practice. ### Is immutable backup an air gap? ### Which is more resistant to ransomware, immutable or air gap? ### Do I still need immutable cloud backup if I have a physical air gap? ### Can attackers modify data on a physical air gap? ### How does an air gap satisfy the 3-2-1-1-0 rule that immutable alone does not? ![Mark Fermor](/assets/mark-fermor-C-vy1NeN.jpg) ![David Bailey](/assets/david-bailey-CnLw95Ao.jpg) ![Kenny Phipps](/assets/kenny-phipps-DxIqwaIL.jpg) Online Now Concierge ## Layer a physical air gap over your immutable backup Talk to the Firevault team about adding a Layer 1 offline gold copy alongside your existing immutable cloud or repository. Takes about 2 minutes. No account needed. Find Out Free 2 mins No sign-up