Having backups is important. Unfortunately Time Machine is known to be a problem with Virtual Machines.

You can schedule backups of your virtual machine. So you will not forget to make them.

You do not have to install anything in your Virtual Machine and the VM does not have to be shut down for it to work.

Using Vimalin gives you a better handle on your backups, where they are, how much space they occupy and if the backup was a success or not.