MOD Cloud: The Multi-Classification Cloud Ecosystem Powering Defence’s Digital Backbone

Overview

If CIRRUS is the transformation programme that moves Defence to the cloud, MOD Cloud — or MODCloud — is the operational ecosystem that results. It is not a single system but an architecture and portfolio of cloud services that together form the foundation of the MOD’s Digital Backbone: a multi-cloud, multi-classification digital infrastructure enabling secure, friction-free information sharing across military, business and coalition domains.

MODCloud integrates hyperscale public, private and sovereign cloud services to support critical operations, decision-making and data exploitation. It encompasses the design, procurement and operation of cloud environments at OFFICIAL, SECRET and TOP SECRET classifications, including the Secret Cloud and integration with commercial software-as-a-service, platform-as-a-service and infrastructure-as-a-service offerings. Its purpose is to enable the sensor-to-decision-to-effector workflows, AI and machine learning, and real-time data access at scale that underpin the Integrated Force Model.

MODCloud provides secure, scalable, modern hosting and digital services for all MOD functions: from battlefield and operational command and control through NEXUS to business support and intelligence through the UK Hydrographic Office and Maritime Domain Awareness. It supports the MOD’s shift from bespoke, legacy platforms to open, upgradeable, integrated solutions — a shift that is as much cultural as it is technical.

Strategic Purpose and Objectives

One Cloud Estate, Every Classification

MODCloud’s strategic purpose is to deliver the core cloud infrastructure for Defence’s digital transformation and Digital Backbone strategy. It supports rapid, secure and cost-effective procurement, operational agility and exploitation of cloud-native and AI and analytics technologies. It is critical to the RAF through NEXUS, the Royal Navy through Maritime Domain Awareness, Defence Intelligence, business systems and enabling organisations such as the UK Hydrographic Office. It enables an integrated force across security domains and with coalition and allied partners.

The distinction between MODCloud and CIRRUS is important. CIRRUS is the transformation portfolio that drives migration, modernisation and innovation. MODCloud is the operational outcome — the live, production cloud estate that Defence uses every day. Together, they ensure that the MOD has both the capability to transform and the infrastructure to operate in a cloud-native world. MODCloud’s multi-classification architecture is particularly significant: it means that users at OFFICIAL, SECRET and TOP SECRET can access appropriate cloud services through a coherent, managed ecosystem rather than through disconnected, bespoke solutions.

Budget and Financial Structure

Programme Value

MODCloud is not a single budget line. Its investment is embedded within portfolio investments in CIRRUS, the Digital Backbone, NEXUS, Maritime Domain Awareness and other programmes. Illustrative investments include the £400 million Google sovereign cloud contract in 2025, £211 million in cloud contracts between 2020 and 2023, £35.1 million for NEXUS Grow and Sustain Air Cloud HE, and £30–£60 million in Secret IT contracts. It is underpinned by the Defence Digital annual budget of over £2 billion and foundational cloud strategy expenditure.

Budget Division and Holder

MOD Defence Digital provides strategic leadership, funding and architecture. Support comes from Crown Commercial Service for procurement, Front Line Commands including the RAF, Royal Navy and Army, Defence Equipment & Support for operations, and service-specific digital teams. MODCloud sits under the Digital Backbone portfolio with a clear cross-Defence stakeholder model. Budget holder responsibility rests with MOD Defence Digital through the Chief Information Officer and Digital Functional Lead, the MODCloud programme office, and the CIRRUS portfolio. Contract delivery is managed by MOD Digital Commercial alongside relevant technology and business process owners.

Procurement and Acquisition

Acquisition Pipeline

MODCloud and related digital infrastructure contracts are published within the MOD’s Acquisition Pipeline, covering CIRRUS, NEXUS, Secret Cloud, Maritime Domain Awareness, Shared Hosting and other programmes. Procurement runs through the Defence Sourcing Portal and CCS framework agreements including G-Cloud, Cloud Compute 2 and TS3. The pipeline includes announced Secret and Edge cloud capabilities, targeting a 2026 minimum viable product for the Secret Cloud and full Digital Targeting Web delivery by 2027.

Tender Information

Landmark contracts include the Google £400 million sovereign cloud award in 2025, ongoing NEXUS cloud-hosted decision systems running from 2023 to 2026, Secret IT system services entering the procurement pipeline in 2024, and MODCloud OFFICIAL public cloud services operational since 2020. Enduring capability delivery for the Digital Targeting Web supports 2026–2027 delivery roadmaps. Tender references are held within the Defence Sourcing Portal and CCS framework tenders, including Cloud Compute 2 (RM6292), G-Cloud, MODCloud S for SECRET, and Secret IT System platform and services identifiers.

Why It Matters

MODCloud is the operational expression of the MOD’s cloud strategy. While CIRRUS drives the transformation, MODCloud is what Defence actually uses — the production cloud estate upon which NEXUS runs, Maritime Domain Awareness operates, Defence Intelligence analyses and business systems function. Its multi-classification architecture means that, for the first time, the MOD has a coherent cloud ecosystem that spans the full range of security classifications, enabling data and services to be shared appropriately and at speed.

The programme’s significance extends beyond technology. MODCloud embodies the MOD’s shift from owning bespoke infrastructure to consuming cloud services — a model that delivers continuous innovation, reduced cost and enhanced resilience. It supports the sensor-to-decision-to-effector workflows that the Digital Targeting Web demands, and it provides the foundation for AI, machine learning and advanced analytics at Defence scale. Without MODCloud, the MOD’s digital transformation is an aspiration without an engine.

For industry, the programme represents one of the most significant cloud markets in UK government. The multi-vendor, multi-framework procurement approach ensures that opportunities are available to hyperscale cloud providers, sovereign cloud specialists, managed service providers, cybersecurity firms and integration companies alike. The emphasis on open architectures, interoperability and continuous evolution means that the MODCloud ecosystem will generate demand for innovative cloud solutions for years to come. Companies that can deliver secure, multi-classification cloud services at scale — and that can integrate with the broader Digital Backbone — will find MODCloud a consistently rewarding market.

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