Azure File Sync: what is it, and why should I use it?

Microsoft's Azure File Sync is a service that extends your on-premises file servers with Azure Files cloud storage. It keeps a local cache of recently used files while the full dataset lives in Azure, giving you both cloud backup and local performance.

Let's see how this service works. Here's a quick overview:

1. You create an Azure Storage account and a file share.
2. Install the Azure File Sync agent on your Windows Server.
3. Register the server and create a sync group.
4. The server syncs files with Azure Files automatically.

Only the most used files stay cached locally (this is known as "cloud tiering"). You can add multiple servers to the same sync group, turning Azure Files into a central hub for branch offices or disaster recovery scenarios.

It's a practical hybrid solution for organizations that still need local file servers but want cloud backup and multi-site synchronization without maintaining a custom replication setup.

There's also a nice Microsoft TechBlog article about Azure File Sync, recommended reading!