This tutorial will show you how to restore a Joomla database backup previously made with phpMyAdmin
First, let's create a new database to store the data that's currently in the Joomla database, just in case there's a problem restoring the backup
1) Scroll down until you see Databases
2) Click MySQL Databases
 
3) Type a name for your backup database, then click Create Database
 
4) Now go to Home
 
5) Scroll down to Databases again
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6) Go to phpMyAdmin
 
7) Click on the Joomla database

8) Click Operations
 
9) Under Copy database to, type the temporary database name

10) Uncheck CREATE DATABASE before copying
 
11) Click Switch to copied database
 
12) Then, click Go
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The database seems to have copied successfuly. Now, let's restore the backup

13) Select the original database

14) After scrolling down to the bottom of the page, click Check All
 
15) Then, choose Empty from the drop-down box

16) Click Yes
 
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Now that the database is empty, we can restore our backup
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17) Click Import
 
18) Browse for and select the backup file

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Scroll down
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19) Click Go
 
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If you encounter any problems, the temporary backup database we created should come in handy