No problem

Yes, just remove that line

afterwards run those querries mentioned above.

The backup is done either via the adminCP of you vBulletin or the phpMyAdmin tool.

Using phpMyAdmin, you need to dump (thats the term for backing up) the database, by selecting Structure and Data and Send.

You may select Add drop tables, too. This tells it, to drop existing tables before restoring your database from the backup. It prevents the Table already exists error.

When you checked all the boxes I suggested, press GO and you should be getting a dialog on where to store the file on your local PC.

Depending on the size of you database, the connection and the speed of Server, the proceedure may take some minutes.

hth

-alex