There are several models.
SIEM on-premise
The components are hosted in the company's infrastructure.
Potential advantages:
- infrastructure control
- data control
- customization
- integration with certain historical environments.
Potential drawbacks:
- infrastructure
- maintenance
- updates
- storage capacity
- administration.
SIEM SaaS / Cloud
The provider hosts the platform.
Potential advantages:
- simplified deployment
- elasticity
- reduced maintenance
- cloud integration.
Potential drawbacks:
- supplier dependency
- cost
- sovereignty issues
- data location
- connectivity dependency.
The choice should depend on the company's context.