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How to download the forum?

Hello, I apologize in advance for such a stupid question. Recently I found a wonderful forum (about fishing) on ​​the net with a lot of interesting content over the years. Read not reread. The problem is that there is a high probability that the administration will close this forum soon. I would not want to lose all this valuable content, I would like to somehow save the forum snapshot locally. Already bought a two terabyte HDD (I love fishing). Someone solved a similar problem? PhpBB forum.