You can convert a virtual machine directly to a template instead of making a copy by cloning.

When you convert a virtual machine to a template, you cannot edit or power on the template unless you convert it back to a virtual machine.

You must be connected to vCenter Server to convert a virtual machine to a template. You cannot create templates if you connect the vSphere Client directly to an ESXi host.

Before you convert a virtual machine to a template, select it in the inventory and power it off.

Right-click the virtual machine and select Template > Convert to Template.

vCenter Server marks that virtual machine as a template and displays the task in the Recent Tasks pane.