Today, we are excited to announce the public preview of backup for Azure file shares. Azure Files is a cloud-first file share solution with support for industry standard SMB protocol. Through this preview, Azure Backup enables a native backup solution for Azure file shares, a key addition to the feature arsenal to enable enterprise adoption of Azure Files.
Using Azure Backup, via Recovery Services vault, to protect your file shares is a straightforward way to secure your files and be assured that you can go back in time instantly.

Read about it in the Azure blog.