Easiest way to backup (and restore) users/posts?

I'm going to delete my current Vanilla install due to problems upgrading (it's messed up). What's the easiest way to back up my users and posts and restore them after a fresh install?
Thank you!
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Install vanilla with a dummy db. Reinstall all your addons. then go into /conf/database.php and change the settings to use the previous table.
Marc explain that recently. You can look for it if you need more details.
Also, I can't find Marc's explanation that Dinoboff referenced. Can anyone give me more clues to search for?