BastilleBSD 
SYNOPSIS
bastille clone [-alx] TARGET NEW_NAME IP
The bastille clone sub-command will create an exact duplicate of the targeted jail, giving it the specified NEW_NAME and IP address.
EXAMPLES
Clone myjail to newjail:
# bastille clone myjail newjail 10.23.3.4/24
Clone myjail to newjail with DHCP (VNET only):
# bastille clone myjail newjail DHCP
Clone myjail to newjail while running, with debug mode:
# bastille clone -xl myjail newjail 10.23.3.4/24