deb-src http://security.debian.org/ stable/updates main contrib
# backports:
- deb http://ftp.debian.org/debian/ wheezy-backports main
- deb-src http://ftp.debian.org/debian/ wheezy-backports main
+ deb http://ftp.debian.org/debian/ jessie-backports main
+ deb-src http://ftp.debian.org/debian/ jessie-backports main
# official debian repository:
# deb http://ftp.debian.org/debian/ stable main contrib non-free