Try reinstalling or updating your VMware tools to fix the issue
You attempt to perform a disk or partition backup that fails with the following error: "Failed to read the snapshot."
As a workaround, use Microsoft VSS instead of Acronis VSS
Independent disks cannot be backed up with the virtual appliance when the virtual machine is turned on
There are two possible causes. Please read the article to fix the issue
The product cannot access the hard disk drive to create a snapshot
This article provides instruction for troubleshooting recovery and conversion to virtual machine failures in Acronis Backup (Acronis Backup & Recovery).
Follow these steps to troubleshoot the recovery and conversion to virtual machine: