“I presume your site isn’t that busy that you’d get a comment or two in the few seconds it would take to switch apps to phpmyadmin”

Of course that wasn’t the issue: I only have 456 posts and 499 comments, little more than one comment per post.
I just miss the ‘dump your database to disk’ meaning…
My fault.
Thanks, maybe in the near future if I’ll change my hosting and I’ll translate your howto for italian speakers in my blog I’ll give you credits.