An organization maintains on-premises Windows file servers across multiple branch offices. The IT team wants to centralize all company file storage in Azure while meeting the following requirements: - Local branch users must continue accessing frequently used files locally with low latency over existing SMB shares. - Infrequently used files must automatically move to the cloud to free up physical on-premises disk capacity. - Changes made on local servers must automatically synchronize with a centralized cloud share. Which Azure service or feature should the organization deploy?

Azure File Sync: ### What Azure File Sync Is **Azure File Sync** is a hybrid cloud storage service that allows organizations to centralize file shares in **Azure Files** while retaining the performance, compatibility, and flexibility of an on-premises Windows file server. It enables bi-directional synchronization between local file servers and cloud file shares. ### How It Meets the Requirements - **Local Caching and Low Latency**: Azure File Sync transforms on-premises Windows Server machines into fast local caches for **Azure file shares**, allowing branch users to retain high-speed local network access via standard **SMB** and **NTFS** file shares. - **Cloud Tiering**: With the **cloud tiering** feature enabled, frequently accessed ("hot") files stay cached on the local server, while infrequently accessed ("cool" or "cold") files are offloaded to Azure Files and replaced locally with lightweight reparse points, conserving local drive capacity. - **Seamless Multi-Site Synchronization**: Changes made across registered server endpoints synchronize automatically through sync groups to the central **cloud endpoint** in Azure Files. ### Key Advantages and Capabilities - **Preserves Access Protocols**: Enables continued use of on-premises protocols and features, including **SMB**, **NFS**, and **Access Control Lists (ACLs)**. - **Flexible Tiering Policies**: Allows administrators to specify volume free space policies and date-based policies to control local storage consumption. - **Rapid Disaster Recovery**: In the event of a local hardware failure, a new server can be configured to pull down the directory namespace metadata almost instantly, rehydrating files on demand. - **Centralized Backup**: Backups can be centralized in Azure Files using Azure Backup without impacting local server performance. ### Why This Is Optimal Azure File Sync is specifically engineered for hybrid file storage scenarios. Alternative migration or management tools like **AzCopy** or **Azure Storage Explorer** cannot provide seamless background caching, cloud tiering, or live bi-directional multi-site file synchronization on Windows Server endpoints.

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