If you’re looking for a quick way to backup your Campfire chats, I can highly recommend James Taylor’s Campfire Archiver. While savvy apps is now on Slack full-time, ensuring we had a backup of Campfire was a long-standing item on our to-do list. It just never got attention.
For a bonus—and possibly for those not yet abandoning Campfire—check out this script from Ron Alleva that removes files from Campfire. We’d often have to hunt down large files that would take up our allotted space and this script would have been handy. To keep our export slimmer, I actually ran the remove script against all of our rooms and then did the archive.