bbcp is a fast data transfer utility developed by Andy Hanushevsky at SLAC National Accelerator Laboratory at Stanford. Using this utility one can achieve substantial increase of data transfer rates over WAN compared to traditional SCP/SFTP. You should be aware that bbcp does not encrypt data. Only authentication is encrypted (bbcp authenticates via ssh, which should be present on the system). If this is a concern, revert to Globus or SCP/SFTP.