Managed disk VM
Managed disks are block-level storage volumes that are managed by ARM. With managed disks, you must specify the disk size, the disk type, and provision the disk. The rest is handled automatically.
Management APIs for Managed Disks are available in the compute provider. The Azure Stack plug-in uses REST APIs to:
Create Managed Disk Snapshot
Export Snapshot (Grant Access)
Unexport (Remove Access)
Delete Snapshot
Single BigData policy can protect both Managed and Unmanaged disk VMs.
During restore it is possible to convert unmanaged disk VM to managed disk.
Storage account is required during restore of managed disk to create temporary vhd file in the target subscription where VM or the disk is being restored. This is due to lack of required API for creating Managed Disk directly during restore.