If you globally replicate an Azure Cosmos account across three regions, you will pay for the total storage cost in each of those three regions. To estimate your storage requirement, see capacity planner tool. The cost for storage in Azure Cosmos DB is $0.25 GB/month, see Pricing page for latest updates.What is Azure data storage?
Azure storage accounts provide a namespace in which to store data objects. These objects could be blobs, file, tables, queues and virtual machine disks.