Hi. You're on the right track. Use the 'ps' command to identify the proces and then kill the process with the 'kill' command.

ps -auxwww | grep <name of process>

kill -9 <process id>

the link below provides a bit more detail:

http://www.vi-tips.com/2009/04/howto-power-off-or-kill-vm-that-is.html

I would be very careful killing any script. The Ghetto script uses other vmware tools and you may leave those tools in an incomplete state.
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For the Disklib_Check() error you probably need to provide a little more information. Running in debug mode and testing only. Version of the script etc. Might want to post that question to the ghetto documents area so that lamw can comment.

The speed of the copy looks to be close to 30GB per hour. Not too bad.

You will need to decide what your disaster plan is. How long can your organization be without access to vital information and processes. I wouldn't want to be dependent on a single ESXi host. A second machine as a standby and testing. Having the NFS store attached to both your production host and the standby host would give you the opportunity to test your backup process.

Ghetto creates a copy of the disk files and a copy of the vmx file. That is enough to run the virtual machine but not a true point in time copy. A clone of a machine would also have additional files like memory, bios, etc. and depending on the process and tools used may also not be a true point in time copy.

It really depends on the individual VM. The ghetto copy could be all you need. If you have databases then a copy occasionally and traditional sql backups inside the VM could be the answer. Web servers are less critical but you want to capture site updates and maybe logs. Domain controllers have other issues. You can't bring them back on line from a clone without doing AD repair.
You really should look at the recovery process more than anything. Once you have a copy it can be added to inventory and started. Think about each vm individually and what might be the approach to satisfy your disaster requirements. And practice, practice.