Site backup, PHP backup and other
https://www.drupal.org/node/22281
https://github.com/exteon/web3backup
http://wiki.civicrm.org/confluence/display/CRMDOC/Backup+Data
http://www.daniloaz.com/en/using-php-to-backup-mysql-databases/
Drupal slaves
https://www.drupal.org/project/autoslave
http://drupal.stackexchange.com/questions/68564/drupal-master-slave-replication
http://www.extropy.com/forums/knowledge-bases-extropedia/mysql/mysql-replication-drupal
https://www.acquia.com/blog/mysql-ha-architecture-drupal
https://mariadb.com/blog/high-availability-drupal-part-1-investigating-issues
http://en.wikipedia.org/wiki/Multi-master_replication
Mysql backups
http://dev.mysql.com/doc/refman/5.1/en/mysqldump.html
https://www.lullabot.com/blog/article/mysql-backups-using-lvm-snapshots
http://sourceforge.net/projects/automysqlbackup/?source=typ_redirect
http://www.percona.com/doc/percona-xtrabackup/2.2/manual.html
http://www.lenzg.net/mylvmbackup/#Docs
Virtual Machine backups
http://vboxtool.sourceforge.net/
http://www.pontikis.net/tip/?id=31