omg, a talking sausage.
To clone a Virtual Machine in VirtualBox, first go to:
/home/[username]/.VirtualBox/VDI
or newer versions:
/home/[username]/.VirtualBox/HardDisk
in the console, use command:
(don't forgot to change the virtual disk name to your existing virtual disk name.)
VBoxManage clonevdi vm1.vdi vm2.vdi