Downloading http://mirror.yandex.ru/debian-backports/dists/squeeze-backports/InRelease...
gpgv: Signature made Fri Feb  7 06:56:50 2014 MSK using RSA key ID 46925553
gpgv: Good signature from "Debian Archive Automatic Signing Key (7.0/wheezy) <ftpmaster@debian.org>"
gpg: Signature made Fri Feb  7 06:56:50 2014 MSK using RSA key ID 46925553
gpg: Good signature from "Debian Archive Automatic Signing Key (7.0/wheezy) <ftpmaster@debian.org>"
gpg: WARNING: Using untrusted key!

Mirror [mirror9]: http://mirror.yandex.ru/debian-backports/ squeeze-backports successfully added.
You can run 'aptly mirror update mirror9' to download repository contents.