sources.list

root@portatux:~# cat /etc/apt/sources.list
deb http://ftp.at.debian.org/debian/ etch main
deb-src http://ftp.at.debian.org/debian/ etch main

deb http://security.debian.org/ etch/updates main
deb-src http://security.debian.org/ etch/updates main

deb http://backports.debian.or.at/backports.org/ etch-backports main contrib non-free

keyring

aptitude install debian-backports-keyring

work with aptitude and backports

backports are disabled by default so we have to use the -t option in aptitude

aptitude -t etch-backports [search|show|install] PAKET