You can protect your virtual machines from data loss and other problems by using snapshots, AutoProtect, complimentary anti-virus software, and backup applications.

Taking a snapshot in Fusion lets you preserve the state of the virtual machine so that you can return to that state.

Fusion can take snapshots of the state of your virtual machine at intervals with the AutoProtect function. This feature is in addition to manual snapshots, which you can take at any time.

Because virtual machines are files, you can back them up by making a copy.

If you use Time Machine, exclude virtual machines from the backup.