I made a backup on waybackmachine, but it saved not all posts but we can do it manually
go to
https://web.archive.org/web/20130718060603/http://citrus.forumup.org/forum-8-citrus.html
and click on every post you can find, if there appears a "resource is not available" click on "Save this url in the Wayback Machine" than this site will be saved.
I am not sure if this works and it is a lot of work to do, but at least a chance to backup the forum...
please post if there is trouble.
unfortunately pictures are not saved
If there is a better way to backup please post here!