If you are new into the Drupal development profession then you might or might not have the need to back up a site quickly or to migrate a site from one server to another. If you have PHPMyAdmin installed on your webserver then backing up is not much trouble for you. However, there is even a more convenient way to back up your MySQL database.
The migrate module for Drupal gives you a really easy way to back up all the pertinent Drupal tables from the site database; all from a really simple web interface. If you want to migrate from Drupal 7 to Drupal 8 then you can search various online resources.
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To get started, go to the Drupal.org site and do a search for the migrate module. Once you found it, download the appropriate source file for whatever version of Drupal you are currently running.
Next, you need to install the module. Simply extract the contents of the compressed file you just downloaded into the /modules directory of your Drupal installation. Next login to your Drupal administrator account and go to the administer->modules page (Drupal 6.19). From here just check the enable box, then hit save and you're all done setting up. You can check out various online resources if you want to know more about it.