With multi-cloud, a company uses more than one cloud provider, for example Microsoft Azure and AWS or Google Cloud. The platforms can take on different tasks. Multi-cloud therefore does not automatically mean that the same application runs at several providers at the same time.
Difference from hybrid cloud
A hybrid cloud connects your own or private infrastructure with public cloud services. Multi-cloud, by contrast, describes the use of several providers. Both models can occur together: a company might run on-premises production systems, applications in Azure and analytics services in a second cloud.
Several independent cloud environments already count as multi-cloud use. A direct network connection between the platforms is only required if the respective applications or data flows need it.
Why companies use several clouds
Possible reasons are special features of a provider, existing systems after a company acquisition or different requirements of individual applications. Each additional platform should serve a concrete purpose. The mere number of providers says little about the quality, security or cost-effectiveness of the architecture.
What becomes more difficult in operations
- Identities and rights: Users, service accounts and privileged access must be controlled across platform boundaries.
- Network and data: Connections, DNS, latency and possible costs for outbound data traffic belong in the planning.
- Transparency: Inventory, logs, costs and security alerts should be brought together.
- Responsibility: Responsibilities for incidents, changes, backup and recovery must remain unambiguous.
Infrastructure as Code can support reproducible deployments. However, uniform templates do not automatically make different services interchangeable. Database functions, permission models and interfaces remain partly provider-specific.
Does multi-cloud increase resilience?
A second cloud alone is not yet a disaster recovery concept. Recovery requires available data, prepared resources, suitable network connections and a tested failover process. Dependencies on shared identity services or internet connections can affect both environments at the same time.
The practical decision is therefore: which task needs which service, and can the team master it in the long term? A clearly justified distribution is more robust than additional platforms without an operating model.