@Mohammad Imran,
Cognite Data Fusion (CDF) is a micro-services architecture SaaS application that is deployed to 3 major cloud service providers today (Azure, Google and most recently AWS). CDF consists of 300+ micro-services which are continuously deployed as many as 1000 times per week across development, staging and production environments. The infrastructure is predominantly Kubernetes based. Storage consists of a polyglot system of technologies based on data type, availability, scalability and performance requirements. Storing and serving time series data, for instance, involves a combination of storage technologies (Foundation db, Kafka, PostgreSQL, Elastic Search). You can read more about availability, business continuity, backups here at the following link:
https://docs.cognite.com/cdf/trust/security/availability_continuity
Hope this helps,
-Jason