advice on clone disk using acronis backup & recovery 11

i read on the help note, and notice that only can use COMMAND-LINE utility to do the cloning

the parameters
--Source=
--Target=

Question:
1) where to find source/target disk number to use?
2) Is the below command use to start the cloning correct?

type: acrocmd clone disk --source=xxxx --target xxxx

xxxx=disk number