Twin directories of backtrack:

[DIR]  ftp://ftp.zedz.net/pub/security/operating-systems/backtrack/
[DIR]  ftp://ftp.ausmac.net/disk1/security/operating-systems/backtrack/
[DIR]  ftp://147.52.159.12/mirrors/linux/backtrack/
[DIR]  ftp://91.121.110.214/pub/backtrack/
[DIR]  ftp://ftp.lt.freebsd.org/pub/linux/backtrack/
[DIR]  ftp://ftp.rz.tu-bs.de/pub/mirror/.mounts/hde1/mirror.switch.ch/mirror/backtrack/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/backtrack/
[DIR]  ftp://ftp.man.szczecin.pl/pub/security/operating-systems/backtrack/