VMware does not recommend backing up your virtual machine using Time Machine. When Time Machine attempts to backup a virtual machine while it is running, it does not create a proper backup. The backup process may also result in reduced performance of the virtual machine. VMware recommends that you exclude your virtual machines from Time Machine backup and instead create a manual backup of the virtual machine.
To exclude the Virtual Machines folder from being backed up by Time Machine:
[Macintosh HD]/Users/<your username>/Documents/.[Macintosh HD]/Users/<your username>/Library/Application Support/VMware Fusion/Virtual Machines/.