You did'nt mention which database you are currently using if its MYSQL. Then you can use phpmyadmin export database function it will transfere your all data into .sql file (in query form) when you exporting the database, check the menu stating "Export Type" in this menu select update. Then press the button, ".sql" file will be generated and it will contain all the queries of your whole database and then you import it in your server phpmyadmin and these queries will only do updating without deleting any thing.