By analyzing the log files generated by the UK National Web Cache and
by a number of origin FTP sites we provide evidence that an FTP proxy
cache with knowledge of local (national) mirror sites could
significantly reduce the amount of data that needs to be transferred
across already overused networks.

We then describe the design and implementation of CFTP, a caching FTP
server, and report on its usage over the first 10 months of its
deployment. Finally we discuss a number of ways in which the software
could be further enhanced to improve both its efficiency and its
usability.

KEYWORDS: mirroring, caching, log summation, usage statistics,
	  object oriented.