What happened
Slack opened an incident at 2:21 PM Pacific on August 13 after users in workspaces with custom data retention policies reported they could not see or load older messages. The problem affected messaging and workspace administration features. Over the following two days, Slack's status updates traced a slow recovery: engineers identified the technical trigger, restored custom retention settings for affected customers, and paused retention processing jobs while they worked on the underlying cause. As of the latest updates, Slack said it was continuing to restore messages, message edits, and file shares using backup methods, with retention jobs gradually being re-enabled. Slack has not published a full accounting of what triggered the incident or whether any messages were permanently removed ahead of their configured retention schedule.
Why it matters for your business
For many small teams, Slack is the de facto system of record: decisions, client approvals, and project history live in channels, not in documents. This incident hits the exact intersection that makes that risky. Custom retention policies are typically set for compliance or legal reasons, and an incident where the retention machinery misbehaves raises uncomfortable questions: were messages deleted early, kept too long, or merely hidden? If your firm is in a regulated field, government contracting, legal, financial services, healthcare, common in the DC area, your retention settings are not just an IT preference; they are a commitment you may need to demonstrate.
What to do about it
- If your team noticed missing messages this week, check Slack's status page history before assuming they were deleted, and follow up with Slack support about your workspace specifically.
- Review who set your retention policy and why; document the setting so an incident like this has a baseline to compare against.
- Keep decisions that matter, contracts, approvals, final scopes, in a durable home like a document system, with chat as the discussion layer, not the archive.