The only line that refers to busybox is if you enable compression, for now, can you please disable it? and give that a try, it's quite limited to begin with so I would not really recommend compressing your backups (VMs < 8GB).
Secondly, I've seen the screen not always display 100% for the cloning as it's just refreshing the screen. Can you go into the backup directory and check if in fact the entire VM was copied? From the looks of the logs below, there are two errors one relating to busybox which is explained above and another where a directory could not be created. Can you ensure there are no issues with that datastore and that is not full or anything?
Please have a quick look at the forum FAQ http://communities.vmware.com/groups/ghettovcb before posting, would be great to have more details about the enviroment as well as enablign debug mode in the logs.
Thanks