The TSAFS has been re-designed to exploit file system characteristics to deliver better performance. This has been done within the constraints of maintaining backward compatibility with the current models of usage. However, to take advantage of these enhancements, it is important that the backup engine appropriately use the API set as described in this chapter. It is also important to understand that the TSA and the backup engine are only two of the many parameters that influence the throughput of the backup system, disk and tape hardware being some of the other notable ones.