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Azure File Sync is the feature that enables asynchronous replication of file shares specifically. It allows you to centralize your file shares in Azure while keeping the flexibility and performance of an on-premises file server. With Azure File Sync, you can sync your on-premises file shares with Azure file shares, meaning that any changes made in either location are synchronized.

This capability is especially useful for scenarios where organizations need to maintain high availability and redundancy of their data across multiple locations. The synchronization happens in the background, which illustrates the asynchronous nature of this process — changes are sent to Azure and applied without requiring immediate action or downtime.

Other options like Azure Blob storage provide different types of storage solutions more suited for unstructured data rather than file sharing. Azure Traffic Manager is used for routing traffic across global Azure regions but does not deal with file share replication. Azure Data Lake is focused on big data storage and analytics rather than file share management. Therefore, these features do not address the specific need for asynchronous replication of file shares.