Here is a simple way to backup your joomla website databases using Telnet/SSH. Why using telnet? You can backup the large joomla databases using telnet which is not possible from PhpMyAdmin interface where memory is an issue.
BACKING UP MYSQL DATABASE USING TELNET
STEP 1:
FTP into your web site where you want to backup the database. Create a folder named ‘backup’ (or any name you want) in your public_html directory. Chmod it to 777. (Note: If your server API is CGI, you will get ‘Internal server error’ with 777. So if this is your case, chmod it back to 755.)
STEP 2:
Telnet into your web site using Putty.
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Backup And Restore For Joomla Database
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