Twin directories of debian-backports:

[DIR]  ftp://193.226.140.51/debian-backports/
[DIR]  ftp://ftp.eq.uc.pt/pub/software/unix/Linux/debian-backports/
[DIR]  ftp://83.166.201.99/debian-backports/
[DIR]  ftp://ftp.tuke.sk/debian-backports/
[DIR]  ftp://ftp.br.debian.org/debian-dists/debian-backports/
[DIR]  ftp://206.167.141.10/data/pub/distro/debian/debian-backports/
[DIR]  ftp://24.215.0.24/Debian/debian-backports/
[DIR]  ftp://206.167.141.10/pub/distro/debian/debian-backports/
[DIR]  ftp://ftp.sh.cvut.cz/storage/1/debian-backports/
[DIR]  ftp://ftp.luna.net/debian-backports/
[DIR]  ftp://ftp.luna.nl/debian-backports/
[DIR]  ftp://ftp.ens-cachan.fr/mirror/Debian/debian-backports/
[DIR]  ftp://linusp.usp.br/debian-backports/