vBulletin 4.2.5 is end of life and will not be receiving any future development. Warning: vBulletin 4.2.5 is not compatible with PHP 7.2.0 or higher.
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The most reliable method of backing up and restoring a database is with shell access via ssh. This is because backing up with a PHP script like phpMyAdmin can result in PHP timeouts errors and an incomplete backup file. Please see the instructions here:
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