Doug,
Thanks for the logs. Yes, it's a bug in the code that builds the rsync_bpc command. It uses the hostName, instead of the hostIP (they are the same in the non-nmblookup case).
There are four places in lib/BackupPC/Xfer/Rsync.pm where you should replace "{host}" with "{hostIP}". I just pushed the change to git; you can see the
diffs here.
It would be great if you could make these changes (either manually edit, apply the diff, or re-install from git) and re-test.
Thanks,
Craig