If you want to save the hassle of upgrading Drupal 7 core from say, 7.4 to 7.7, you can install Drush and then use it from SSH to back up your site and then update core with the follwoing command:drush update
Just make sure you’re in the directory of the Drupal installation you want to update.
Updating Drupal 7 Core using Drush
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I'm a web developer based in the East Midlands, UK and if I keep up the current rate, I might have developed 3 million sites by the time I retire