If anyone wants to download their own posts and forum data before the forum disappears later today, you can do that by clicking on your profile picture (upper right corner of screen), then click on the preferences icon (last one), then click on Activity.
In the menu on the left, you should see a Download All option, click on that and follow the prompts.
That will create a private DM with a link to a Zip file, click on the link to download it then double-click on the Zip file to expand it. The Zip file contains a bunch of CSV files which you can open in an app like Excel or Numbers (on Mac). Your actual forum posts are located in the file called user_archive.csv.
Thanks for the memories everyone!