--- title: "Mapping Offline Secure Storage to the NCSC Prin… | Firevault" description: "A control-by-control mapping of Firevault Offline Secure Storage against the NCSC guidance on ransomware-resistant backups, written for UK government, CNI…" 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": "Protect what matters with Offline Secure Storage and control what moves with Control by Firevault. 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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) [Whitepapers](/learn/whitepapers)/ whitepaper whitepaper · 27 July 2026 # Mapping Offline Secure Storage to the NCSC Principles for Ransomware-Resistant Backups A control-by-control mapping of Firevault Offline Secure Storage against the NCSC guidance on ransomware-resistant backups, written for UK government, CNI operators and regulated enterprises. ![Mark Fermor](/assets/mark-fermor-aWtKNSv7.jpg) Mark Fermor Director & Co-Founder, Firevault 2 min read Share [](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Fwhitepapers%2Fncsc-ransomware-resistant-backups)[](https://twitter.com/intent/tweet?url=https%3A%2F%2Ffire-vault.com%2Flearn%2Fwhitepapers%2Fncsc-ransomware-resistant-backups&text=Mapping%20Offline%20Secure%20Storage%20to%20the%20NCSC%20Principles%20for%20Ransomware-Resistant%20Backups%0A%0AA%20control-by-control%20mapping%20of%20Firevault%20Offline%20Secure%20Storage%20against%20the%20NCSC%20guidance%20on%20ransomware-resistant%20backups%2C%20written%20for%20UK%20government%2C%20CNI%20operators%20and%20regulated%20enterprises.)[](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Ffire-vault.com%2Flearn%2Fwhitepapers%2Fncsc-ransomware-resistant-backups)[](mailto:?subject=Mapping%20Offline%20Secure%20Storage%20to%20the%20NCSC%20Principles%20for%20Ransomware-Resistant%20Backups&body=A%20control-by-control%20mapping%20of%20Firevault%20Offline%20Secure%20Storage%20against%20the%20NCSC%20guidance%20on%20ransomware-resistant%20backups%2C%20written%20for%20UK%20government%2C%20CNI%20operators%20and%20regulated%20enterprises.%0A%0Ahttps%3A%2F%2Ffire-vault.com%2Flearn%2Fwhitepapers%2Fncsc-ransomware-resistant-backups) ![Mapping Offline Secure Storage to the NCSC Principles for Ransomware-Resistant Backups](https://zomvctmqpgirvjnvawlz.supabase.co/storage/v1/object/public/article-images/whitepapers%2Fncsc-ransomware-resistant-backups.jpg) whitepaper Why it matters ## What this means for organisations holding critical data A control-by-control mapping of Firevault Offline Secure Storage against the NCSC guidance on ransomware-resistant backups, written for UK government, CNI operators and regulated enterprises. **On this page** The National Cyber Security Centre (NCSC) publishes clear, non-negotiable guidance on how UK organisations should design backups that survive a [ransomware attack](/threats/ransomware). The guidance emphasises that at least one backup copy must be genuinely offline and out of reach of an adversary who has taken control of the production estate. This whitepaper maps every NCSC principle for ransomware-resistant backups against Firevault [Offline Secure Storage](/offline-secure-storage) (OSS). It is written for accounting officers, senior information risk owners (SIROs), CISOs, and heads of resilience inside UK central and local government, the NHS, defence, critical national infrastructure, and regulated financial and legal services firms. Principle 1 - Backups should be resilient to destructive action. OSS holds gold-copy records inside a Firevault bunker with no persistent network path from production. An attacker who compromises Active Directory, a hypervisor, or a cloud tenant cannot reach, encrypt, or delete the offline copy. Principle 2 - At least one backup should be offline, off-site and offline-capable. Every OSS deployment satisfies this by design. Access is only possible during scheduled, identity-verified windows via the LUV (Locked User Vault) interface. Outside those windows the media is physically disconnected. Principle 3 - Backups should have a separate identity, authentication and authorisation model. OSS never reuses production identity. Access is bound to hardware-backed passkeys, sanctioned devices, and a separate authorisation flow that cannot be pivoted to from a compromised corporate SSO. Principle 4 - Backups should be regularly tested. OSS ships with structured restore rehearsals, evidence packs suitable for NIS Regulations, DORA and PRA SS1/21 audit, and CAF-aligned reporting for Objectives A to D. Principle 5 - Backups should be monitored, but monitoring must not create an attack path. OSS telemetry is one-way. Health and capacity signals leave the bunker; nothing writeable enters it from the corporate network. The paper also covers the 3-2-1-1-0 rule, the difference between immutable cloud backups and a [physical air gap](/how-it-works/offline-secure-storage), procurement notes for G-Cloud and DPS frameworks, and a readiness checklist you can take to your next board or audit committee. Request access below to receive the full PDF. ## Download this whitepaper Free access with registration Full name \* Work email \* Company Job title I agree to receive communications from Firevault and accept the [Privacy Policy](/privacy-charter). \* Get free access GDPR compliant No spam 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. 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) How Firevault would handle this ## A recovery copy an attacker cannot reach Offline Secure Storage® keeps a clean copy of your data on hardware that is physically disconnected, so backup and recovery do not depend on systems an intruder can touch. [Get started](/get-started)[Talk to the team](/demo) **Hardware**Your copy sits on dedicated encrypted hardware **Disconnect**Offline by default, connected only when you say so **Recovery**A known-clean copy to rebuild from, on your timetable **Location**Held in a secure Firevault Bunker More research ## Other whitepapers [playbook ### A Control Blueprint for Aerospace & Aviation An engineering blueprint for communication pathways, operational states, remote access, rapid isolation and assured recovery across aerospace and aviation. ](/learn/whitepapers/aerospace-playbook)[whitepaper ### Firevault Legal Playbook: Offline Secure Storage for Legal Firms ](/learn/whitepapers/legal-playbook) Related Reading ## You may also find these useful [ ![Airport WiFi sign-ups turn into a national data problem as 8.7 million customer records are accessed](https://zomvctmqpgirvjnvawlz.supabase.co/storage/v1/object/public/article-images/manchester-airports-group-data-breach-2026.jpg) Insight ### Airport WiFi sign-ups turn into a national data problem as 8.7 million customer records are accessed Manchester Airports Group has confirmed that criminal hackers accessed the data of about 8.7 million customers across Manchester, East Midlands and London Stansted. Most of it came from free terminal WiFi sign-ups and from car parking, lounge and fast-track bookings. 27 Aug 2026 5 min ](/news/manchester-airports-group-data-breach-87-million-customers-2026)[ ![Premier League moves the goalposts as cyber rulebook introduces 22 security control areas](https://zomvctmqpgirvjnvawlz.supabase.co/storage/v1/object/public/article-images/premier-league-cyber-rulebook-2026.jpg) Regulation ### Premier League moves the goalposts as cyber rulebook introduces 22 security control areas Rule J.9 and Appendix 11 put cyber security into the Premier League rulebook, with phased deadlines, annual evidence and 22 control areas spanning club, stadium and supplier operations. 27 Aug 2026 14 min ](/news/premier-league-cyber-rulebook-appendix-11-2026)[ ![T-Mobile pulled the plug on Salt Typhoon. It took a car journey to get there.](https://zomvctmqpgirvjnvawlz.supabase.co/storage/v1/object/public/article-images/tmobile-power-pull-salt-typhoon-2026.jpg) Insight ### T-Mobile pulled the plug on Salt Typhoon. It took a car journey to get there. T-Mobile's security chief ended months of failed software remediation by driving to the data centre, clearing ID, finding the cabinet and physically pulling the power supply from the compromised hardware. Disconnection was the right control. Firevault Control is designed to take the same action in under six milliseconds. 27 Aug 2026 7 min ](/news/tmobile-severs-network-cable-salt-typhoon-hackers-2026)