If you are running it on ESXi, go to your web browser and goto the IP address of your ESXi server. On the right hand side, you can “Browse datastores in this host’s inventory” which is an option on the right side of the screen. Once you authenticate to the server, you can browse the datastore and backup your VM.
OR
if you have the vshpere client installed. You can browse your datastore from within the program and download the VM to an external drive with the datastore manager.