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Re:Story of Mattermost: Open-Sourced Competitor to Slack by octokatt on Thursday December 19, 2019 @11:27AM (#21836325)
I think the concern here is a pre-emptive rage-quit of channels. A team member is aware they are about to be let go, and decide to archive every channel they are a part of on the way out.

What controls are in place to prevent this from happening in the Team Edition?

Re:Story of Mattermost: Open-Sourced Competitor to Slack by the_icelander on Monday December 30, 2019 @12:04PM (#21914818)
Archiving a channel in Mattermost just sets a flag in the database. Once the bad actor is removed a simple query can restore the channels they archived. Something like: `UPDATE Channels SET DeleteAt = 0 WHERE DeleteAt > [some timestamp]`

There's also a CLI command to restore the channels. While this won't keep it from happening it should get things back to normal fairly quickly.