Here is how to quickly back and restore your mysql database with Navicat.
I°) Backup:
Right click on the database you want to backup, select "dump sql file":
Enter a file name and click "Save":
Then click "Start" and wait:
II°) Restore:
Right click on a database you just created, select "execute a batch file":
Select your backup file (.sql) clicking on the button "..." then click "Start" and wait.
III°) Notes:
Of course you can select only one table to save or use another software to do this (like phpmyadmin).