Azure Cosmos DB’s point-in-time restore can be used to restore a deleted account, database or container. It can also restore into any region that has a backup and recover from an unplanned write or delete operation within a container.
These apply solely to SQL API and Azure Cosmos DB API for Mongo DB.
The data backup runs in the background without using any extra provisioned throughput and does not affect the performance or availability of the database. Additionally, if you already use periodic mode, a migrate feature will allow you to transition to continuous mode.
For a look at design and more information on what is and isn’t restored, check out the documentation here: https://docs.microsoft.com/en-us/azure/cosmos-db/continuous-backup-restore-introduction