Cloning VirtualBox VDI file

before cloning, make sure detach VDI file from its VM.

i need to periodically backup my precious VDI file (my VM) under VirtualBox. copy and paste the VDI will NOT work.

the correct way is to use vBoxManage tools.

vboxmanage clonevdi "e:\master.vdi" "e:\clone.vdi"

this is the command assuming your host is Windows. should ur VirtualBox is running on Linux - just remove the "

for example, 

vboxmanage clonevdi /usr/dindon/master.vdi /usr/dindon/clone.vdi