If you do a full wipe and reinstall you would lose it all. If you want to keep the structure then you would need to delete all posts first then all users unless you want to keep them

This.

And this.

Perhaps structure was the wrong word? How about set up? :D

Splendid. . .

Its hard to help someone when its hard to understand them :)

Its too easy to help any person requesting for technical support, in case he is able to explain his problems in easiest way a developer can understand..

Can you tell you what exactly you want to do saving structure ? *I assume you definetly want to delete all the threads/posts/users/attachments.*
1. Some complex vbulletin configuration settings you have made ?
2. You want to save all the forums.
3. Any other thing you are trying to elaborate ?

Nothing to elaborate on thanks.

I think now I have the solution.