We are currently have on our road map this feature for Point-in-Time Restore (PITR) with continuous and on-demand backups. We will update the status here as this feature progresses.
This is now done: https://docs.microsoft.com/en-gb/azure/cosmos-db/sql-query-group-by
We’re excited to announce that we are making this a lot easier with our preview of Autopilot. With Autopilot, Azure Cosmos DB will automatically manage and scale the RU/s of your containers based on the usage. This eliminates the need for custom scripting to change RU/s and makes it easier to handle bursty, unpredictable workloads.
You can try out Autopilot in your Cosmos accounts by going to the Azure Portal and enabling the feature in the “Preview Features” blade.