Not to be that guy... but your link explains. Like right in the first 5 sentences. > The check script runs on a regular basis and polls for the lastsync file in the root of our repository layout. This file is regularly updated on the central repository, so checking the value within allows one to see if the mirror has synced recently. There is a file called lastsync. It is read < http://mirror.csclub.uwaterloo.ca/archlinux/lastsync>
