Most information on Debian mirrors lists three sites in Australia.
If you're looking for another Australian-specific Debian GNU/Linux
mirror site then here is a list of all the official ones:
ftp.tower.net.au /pub/linux/debian (Tower Networking P/L - Perth)
ftp.it.com.au /mirrors/linux/debian (Informed Technology - Perth)
ftp.usyd.edu.au /linux/debian (Sydney University - Sydney)
The tower.net.au site is pretty much up-to-date but connections to it
can become rather slow. Same goes for the it.com.au site. I expect
the problem is saturation of the circuits to Perth.
For me the usyd.edu.au site usually provides much faster response but
it was last updated on Mar 9 - about 2 months ago.
Are there any other official Debian mirrors in Australia? Is there
anyone who can check if U. of Sydney's archive maintainer expects to
update their mirror?