On ESXi Free, there is no possibility to clone a virtual machine from the GUI.

This details how to clone a virtual machine from the command line.

1. Enable SSH on the ESXi host using the GUI.
   Start the VMWare Client.
   Select the ESXi Host.
   Select the Configuration Tab, then Security Profile.
   In Services select "Properties".
   
2. Login to the ESXi host using SSH.
   
   

3. cd into the datastore 

   For example:

   cd /vmfs/volumes/datastore

    

4. Create a new directory for the clone:

   mkdir vm-name-clone

    

5. cd into the clone directory
   

   cd vm-name-clone

    

6. DO THESE STEPS FOR EACH DISK THE VM CONTAINS
   
   
   1. Locate the vmdk file for the current version of the disk to clone in the original VM directory. 
      For example, for the first snapshot of the disk, the disk name will be disk-name-000001.vmdk 
      
      

   2. Clone the disk using the following command

      vmkfstools -i /vmfs/volumes/datastore/vm-name/disk-name-000001.vmdk ./disk-name.vmdk -d thin

      This will create a clone of the disk, thin provisioned.
      
      
   3. Copy the other VM files into the directory.
      
      
   4. Edit the VM file if necessary, and change the name of the mounted disk to the newly cloned disk. 
      For example change this line:
      

      scsi0:0.fileName = "disk-name-000001.vmdk"
      
      

      To this:
      

      scsi0:0.fileName = "disk-name.vmdk"

       

7. That's it. The new VM is ready to use or to be copied somewhere else.