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I have a section of the forum that it has no active users.
I would like to remove it.
How do I save it (I want to save everything, section, name, description, permissions for users, topics, posts, IDs, etc..)?
I want to remove the section of the forums from the database, but I want to have a copy on your computer, so I can restore the section of the forum in the future.

PS
Very important is to save all the IDs, otherwise all active links no longer work.

If you mean a Category, you can just set its display order to 0 and it won't show. Storing all the posts separately would be quite complicated as the posts aren't stored in separate database tables.