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My database is not backed up / My backup file is 0Kb

• Ensure that your host allows you to access mysqldump. You can try to narrow the problem by Debugging via SSH.

What is the difference between WP-DBManager and WP-DB-Backup?

• WP-DBManager uses mysqldump application to generate the backup and mysql application to restore them via shell.
• WP-DB-Backup uses PHP to generate the backup. In some cases WP-DB-Backup will work better for you because it requires less permissions. Not all host allows you to access mysqldump/mysql directly via shell.
• WP-DBManager allows you to have automatic optimizing and repairing of database on top of backing up of database.

Why do I get the message "Warning: Your backup folder MIGHT be visible to the public!"?

• Ensure that you have renamed htaccess.txt to .htaccess and placed it in your backup folder (defaults to wp-content/backup-db/)
• If you are 100% sure you have did that and have verfied that the folder no longer is accessible to the public by visiting the URL http://yousite.com/wp-content/backup-db/, you can safely remove it by deleting add_action('admin_notices', 'dbmanager_admin_notices'); on line 191 in wp-dbmanager.php.