Backup MySQL Database
From James's Wiki
back it up with:
mysqldump -u <username> -p<password> <database name> > /media/temp/<database name>
NOTE: there is no space between -p and the password
restore:
mysql -u [uname] -p[pass] [db_to_restore] < [backupfile.sql]
Source: http://webcheatsheet.com/sql/mysql_backup_restore.php