My Virtual Machine was named http1 so I cloned the vdi as http2.vdi using the VBoxManage command:
VBoxManage clonevdi http1.vdi ../pathtonewlocation/http2.vdi
The output was:
Clone hard disk created in format ‘VDI’. UUID: 9e65bd30-663e-4bf8-acd2-3120d1f41fec
Then create the new Virtual Machine in the VirtualBox GUI:
Machine > New
On the third step for ‘Virtual Hard Disk’ choose ‘Use existing hard disk’ and select the cloned vdi disk image.
Boot the new VM and change the hostname and IP address by editing the following files: