What’s open source options are available for archiving a community slack group?
Here’s one: https://bitbucket.org/ul/slack-archivist. I got this message from the creator of that one:
Simple bot archiving your slack team messages. Just customize and run rtmbot.py as daemon and do cli.py export regularly. As far as I know there are also other solutions lying around. Probably some of them are more mature than mine.