ASR supports dynamic disks. However, the OS must be on a basic disk.

Resizing a disk on the protected VM is supported.

For every protected disk, data is replicated to a Managed Disk in Azure.

Azure Storage currently does not support:
- OS disk sizes greater than 2TB
- data disk sizes greater than 8TB

UR38 increased data disk size support from 4TB to 8TB. This is applicable only when writing directly to managed disks.