Using more than one public cloud provider sounds like obvious risk management: if one fails or raises prices, you move to another. In reality, a multi cloud strategy can deliver real benefits, but it also multiplies complexity, skills requirements and sometimes cost. This article separates the genuine advantages from the marketing, and suggests realistic patterns for businesses that do not have a large platform engineering team.
What multi-cloud means
Multi-cloud simply means using services from two or more public cloud providers, for example AWS and Google Cloud, or Azure and a smaller VPS provider. It is different from hybrid cloud, which combines public cloud with your own on-premises infrastructure, though an organisation can be both.
It helps to distinguish two kinds:
- Accidental multi-cloud: different teams or acquisitions picked different providers, or you use one cloud for infrastructure and SaaS products that happen to run on others. This is extremely common.
- Deliberate multi-cloud: a conscious architectural choice to run workloads across providers for specific reasons.
Most of the debate concerns the deliberate kind.
Real benefits of a multi cloud strategy
Best service for each job
Providers have different strengths. A company might run its main application on AWS, its analytics on Google BigQuery, and use Azure for workloads tied to Microsoft licensing. Picking services on merit, workload by workload, is the most practical and common reason for going multi-cloud.
Reduced dependence on one vendor
Having proven experience on two platforms strengthens your position in commercial negotiations and makes a future move less daunting. It also limits the impact of a provider discontinuing a service you rely on.
Resilience against provider-wide problems
Large outages occasionally affect a whole region or a global service of one provider. A second provider can protect against this, but only if the workload is actually able to run there, which is harder than it sounds (see pitfalls below).
Regulatory and geographic needs
Data residency requirements, customer contracts, or the need for a region one provider lacks can push certain workloads to a particular cloud.
The pitfalls
Complexity multiplies
Every provider has its own identity system, networking model, console, CLI, billing and terminology. Your team must understand all of them well enough to secure them. Misconfiguration is a leading cause of cloud security incidents, and two platforms offer twice the opportunity.
Lowest common denominator
To make an application portable between clouds, teams often avoid each provider's best managed services and build on generic virtual machines and containers. That can mean running your own databases and queues, giving up much of the operational benefit that drew you to the cloud.
Data gravity and egress fees
Data is heavy. Moving it between providers is slow and incurs data transfer (egress) charges. An application in one cloud constantly querying a database in another adds both latency and cost.
Lost volume discounts
Committed-use and volume discounts reward concentrating spend. Splitting it can reduce the discounts available on each side.
Split visibility
Monitoring, logs, cost reports and security alerts end up in different places. Without consolidation, problems hide in the gaps between consoles.
Multi-cloud failover: harder than it looks
Running the same application actively on two clouds, ready to fail over, requires:
- Identical deployments on both, kept in sync by automation.
- Data replicated across providers with an acceptable lag, plus a clear rule for which copy is authoritative.
- DNS or global load balancing that can redirect traffic quickly.
- Regular failover tests, since untested failover rarely works.
For many businesses, deploying across multiple availability zones, or multiple regions, within one provider gives most of the resilience at a fraction of the effort. Consider multi-cloud failover only when the cost of a provider-wide outage clearly justifies it.
Practical patterns that work
| Pattern | Description | Complexity |
|---|---|---|
| Workload by provider | Each application lives on the cloud that suits it best; no cross-cloud runtime dependencies | Low to medium |
| Cross-cloud backups | Production on one provider, backups stored on another | Low |
| Independent DNS and CDN | DNS and edge services from a provider separate from hosting, allowing traffic to be redirected | Low |
| Portable platform | Containers and Kubernetes with infrastructure as code, deployable to more than one cloud | Medium to high |
| Active-active across clouds | Live traffic served from two providers simultaneously | High |
The first three give meaningful benefits with modest effort. Storing backups with a second provider, using separate credentials, is particularly valuable because it also protects against account compromise.
Tools that help
- Terraform or OpenTofu to define infrastructure on several providers with one language and workflow.
- Kubernetes as a common runtime, accepting its own operational overhead.
- A single identity provider with single sign-on into each cloud console.
- Centralised monitoring and logging, for example Prometheus and Grafana or a commercial observability platform.
- Open-source building blocks such as PostgreSQL, Redis and RabbitMQ, which run anywhere. Our open source solutions page covers these.
Questions to answer before committing
- What specific problem will a second provider solve, and is there a simpler fix?
- Do we have the skills to operate and secure both platforms?
- What will cross-cloud data transfer cost at our volumes?
- Who owns cost and security visibility across both?
Answering these honestly usually points to a targeted approach rather than "everything everywhere". For an independent assessment, see our cloud solutions page.
Key takeaways
- A multi cloud strategy works best when each workload is placed on the provider that suits it, not when everything runs everywhere.
- Benefits include best-of-breed services, less vendor dependence and protection for backups.
- Costs include complexity, skills, egress fees, lost discounts and split visibility.
- Multi-zone or multi-region within one provider often delivers enough resilience on its own.