How to export data from a imageboard--

--so I can import it on a new imageboard? (rest of Subject)

Well, the title pretty much sums it all. I have a buggy, unused imageboard, and I was able to set up a good flawless (not actually, it's Kusaba lol) imageboard, but the old imageboard has about 1337 posts, and I can't be bothered to repost the whole thing, and I was wondering if there is a way to do it, any help will be appreciated.

Yes, they're both Kusaba.

Yeah, well, I've been trying to get a 4Chan-esque Imageboard, and from my null experience, that's the closest one to 4chan's (although it has terrible flaws).