Copy my data from a existing db to a new db I have a database which has my data's that I have been working for months. Now, I want to delete that db. What concern's me is that the data's that I have might come in handy in the future development. So I want to get a backup for this db, where I can get all the data's and table structures in this db as a backup and then delete it.

I am confused about how to do this.
Have a look at the mysql_dump dump utility (MySQL docu).

Alternatively you can use the Export function of PhpMyAdmin to generate a SQL file containing all you structure and data.