This is probably a VMware issue. Try the steps described in the article to resolve it.
This is VMware issue
Acronis Backup & Recovery 10 Advanced Server Virtual Edition supports Microsoft Hyper-V and VMware ESX/ESXi on the host level
Acronis Backup & Recovery 10 Agent for ESX/ESXi supports VMware ESX Infrastructure version 3.5 Update 2 and higher
Acronis Agent for ESX/ESXi does not support free VMware ESXi. Acronis Agent for ESX/ESXi supports VMware ESX as a component of VMware Infrastructure Foundation, VMware Infrastructure Standard, VMware Infrastructure Enterprise
Acronis Agent for ESX/ESXi is delivered as a virtual appliance
Acronis Agent for ESX/ESXi installs on VMware ESX. All virtual machines can then be managed from Acronis Management Console connected to the installed Acronis Agent for ESX/ESXi
Unlock the partition using diskpart
ESX Server mounts the storage using UUID. With the hard disk changed, UUID changes too. Hence, ESX fails to mount
You can use Acronis True Image Echo to convert a backup archive (*.tib) to a virtual disk (.vmdk, .vhd, .hdd). You can also back up a virtual disk and restore it to a physical disk