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My group uses Roman fire signals [1].

this is a greatly underrated comment.

Email, if it's actually important. Then if emergency, you can always hop on IRC, Skype, Messages/SMS, etc.

All my team also uses Zoom, so we just switch to a group on Zoom when Slack goes down. It's not quite as nice as Slack but it gets the job done.

My team uses Voxer threads as backup during times like this. We also use Voxer when it takes too long to type explanations out on Slack.

Secure Scuttlebutt

Is this a bob reference??

Message in a bottle

RocketChat - Self-hosted, not backup, primary. Outage like this validates that decision.