Azure
Backup users will now have immutable WORM storage for their backups when
immutability is enabled and locked on a Recovery Services Vault. When
immutability is enabled, it ensures that a Recovery Point, once created, cannot
be deleted or have its retention period reduced before its intended expiry.
Now, when immutability is locked, Azure Backup will also use WORM-enabled
immutable storage to meet any compliance requirements. This feature is
applicable to both existing and new vaults with locked immutability. It is
currently in preview in limited regions.