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. For more information, see Best practices for virtual machine backup (programs and data) in VMware Fusion (1013628).
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/
.