This is a command line tool and you must use the Terminal to use it. So, in that case, you might as well use the ditto -rsrcFork command which is used by CCC to copy and clone files and volumes.
I installed xtar, but haven't used it yet. It installs in /usr/local/xtar with a symlink to /usr/bin and there's no man page, but there is a help page. xtar --help
It's based on GNU-tar, an opensource unix archiving utility. BTW, tar (tape archive) is included in OS X.