Arch Mirrors are sites that specialize in the distribution of arch archives. Here is a list of Arch archives:
http://mirrors.sourcecontrol.net - (Updated every 20 minutes) This is the "911" mirror archive. If you delete your archive can not find an archive, or someone else's archive breaks on you, try here. As a "911 mirror", the owner requests that you do not pull from these archives on a habitual basis.