STEP 1.
First, copy data from server. For this you can use some FTP agent or Total Commander(TC), in our example we will use TC. In TC go to Net - FTP Connect… and click on New connection… button. Fill the  a, b, c and d field with data given by your host provider and than click on OK. In Connect to: panel select your server and click on Connect button.

STEP 2.
When you reach server space select all joomla files from server and copy to your local drive

STEP 3.
Now you will need to backup database. For that purpose we will use phpmyadmin. To reach phpmyadmin use datas given by your host and log into phpmyadmin. When you do this in left panel select joomla database that you want to copy to local drive. After that click on Export.

STEP 4.
In the bottom of the page check in Save as file, select option “zipped”, click on button Go and choose location on local drive where you want to save database.

Finally, you will have backup of your site.