Symptoms

1. You have a Windows VM with dynamic disks (LDM volumes).
2. You create an agentless backup of this VM using Virtual Appliance.
3. When you check the backup archive contents, you notice that drive letters are displayed incorrectly.

Cause

Acronis Agent cannot enumerate drive letters for agentless backups of machines that contain Windows dynamic disks.

Solution

Install the Agent inside the virtual machine, register the machine in Cyber Protection console and create a new backup plan.

Aside of disk representation, neither Hyper-V nor ESXi support creation of application-consistent snapshot of VMs which run dynamic disks, which is why backing up these VMs with Agents installed inside the guest OS is the most reliable backup method.