[mirror] Don't mirror squeeze-backports binaries

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

group_vars/mirror_backend.yml

@@ -18,11 +18,6 @@ glob_ftpsync:
       cron_time: "40    *"
       rsync_host: ftp.fr.debian.org
       rsync_path: debian-security
-    - name: backports
-      dest: debian-backports
-      cron_time: "07 3,15"
-      rsync_host: ftp.fr.debian.org
-      rsync_path: debian-backports
     - name: ubuntu
       dest: ubuntu
       cron_time: "43 5,17"