The following steps show you how to make a copy of virtual box hard disk:

  1. Shut down the virtual machine you would like to copy.
  2. From File -> Virtual Media Manager…, select the virtual machine you would like to copy and click “Release” from the Action toolbar.
  3. It will ask you to confirm release. Click “Release” to release it.
  4. In your command prompt, run the following command to set the new UUID for the newly created hard disk.C:\Users\Public\VirtualBox>”C:\Program Files\Oracle\VirtualBox\VBoxManage.exe” internalcommands sethduuid “Windows XP Professional – Clean.vdi”

    Click the below image to see the screenshot:

  5. In the File -> Virtual Media Manager…, add the new image you have created in step 4.
  6. Press the New button to create a new virtual machine and link to the one created in step 4.