Azure Backup has increased the size of datasources that can be protected to 54400 GB (from 1700 GB). It is applicable to all data sources including volumes, Hyper-V VMs, SQL Database, SharePoint farms, Exchange Server, system state, and BMR backups.
For more information about how it is applicable to various workloads, see the following Azure blog post:
Azure Backup enables backup of large volumes, VMs, databases and more.