Linux to the rescue. This sure beats using Export from PhpMyAdmin, it can be slow and may time out with large databases.

mysqldump -a -u USER -p DBNAME > /path/to/backupname.sql

http://www.metatitan.com/mysql/6/how-to-backup-and-restore-large-databases-in-mysql.html

Find the size of a directory

du -sh /dir

How to remove files older than 60 days

find * -mtime +60 -exec rm -R {} \;

http://tuts4tech.net/2009/06/19/how-to-install-wordpress/