To upgrade your Ubuntu 12.04 “Precise Pangolin” server to BackupPC 3.3.0, just upgrade from my APT repository.
apt-get update apt-get install backuppc
If you previously used my Samba 3.5.x packages to work around the bug with BackupPC 3.2.1, this is no longer necessary. Remove the hold and upgrade with:
echo "smbclient install" | sudo dpkg --set-selections apt-get dist-upgrade
If you have other pending upgrades, this may install them as well.