Incremental snapshots are cost-effective point-in-time backups of Azure Managed Disks. They are billed for the changes to disks since the last snapshot and are always stored on the most cost-effective storage, Standard HDD storage, irrespective of the storage type of the parent disk.
With cross-region snapshot copy now in preview, you can easily copy of incremental snapshots to any region of your choice. Azure manages the copy process and ensures that only changes since the last snapshot in the target region are copied over - reducing the data footprint and recovery point objective (RPO).
Read the documentation to learn more about cross-region snapshot copy.