how to mysql backup and restore

You can take backup of mysql  by mysqldump command and also you can store it by using mysqldump
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First search on Google.. U will find many websites.
still If u have issue then u can ask.

But first do Google.

Bro Don't take it in wrong sense, we need to improve our Google search skill as well.

http://www.tecmint.com/mysql-backup-and-restore-commands-for-database-administration/
http://webcheatsheet.com/sql/mysql_backup_restore.php