One or more shareable VHDs are attached to virtual machine '%1'. Back up programs that use the Hyper-V VSS writer cannot ...

One or more shareable VHDs are attached to virtual machine '%1'. Back up programs that use the Hyper-V VSS writer cannot back up volumes that are backed by VHDs which are potentially attached to other VMs. To avoid potential data loss, use another method to back up the data on the shareable VHD. If you restore the data on this virtual machine, make sure to check the data of shareable VHD for integrity. (Virtual machine ID %2)