Slack retention settings: how long should a company keep messages?

Is there a required retention period for Slack messages?#

There is usually no single required retention period for Slack messages; obligations follow the content of a message, not the tool that carried it. A thread approving a pricing exception may be a contract record, a conversation about an employee's leave may be an employment record, and a channel used to coordinate an audit may fall under financial recordkeeping rules.

Some sectors carry specific rules for business communications, and companies in regulated lines of work should have counsel confirm whether chat counts as a required record for them. For most B2B software companies the practical question is different: which channels contain records you must keep, which contain records you want to keep, and which contain chatter that only adds exposure.

A separate duty arises when litigation or an investigation is reasonably anticipated. From that point, routine deletion has to stop for the relevant people and topics, whatever the workspace setting says.

A decision table by channel type#

A channel-type decision table turns a vague policy into settings an admin can actually apply. Group channels by purpose, name the driver that sets the period for each group, and note where the history has business value beyond compliance.

The table uses relative terms on purpose. Actual periods depend on your contracts, your industry, the states where you employ people and your counsel's advice, so fill them in with your legal team rather than copying another company's numbers.

What your Slack plan lets you configure#

Your Slack plan determines how finely you can apply that table. Slack says that by default it retains all messages and files for the lifetime of the workspace, that admins can set custom deletion periods instead, and that message and file deletion is permanent. On the free plan, Slack says only the last 90 days of messages and files can be viewed and searched, and content more than one year old is permanently deleted.

Export and preservation tools also depend on the plan. Slack's export help states that Workspace Owners and Admins on every plan can export public channel messages and file links in JSON, while exports that include private channels and direct messages are offered only on Business+ and Enterprise and must be applied for. Slack also says a legal hold saves messages and files regardless of retention settings, even if members edit or delete them; legal holds are an Enterprise-tier feature. Plan names and features change, so confirm each point against Slack's current documentation and your contract before writing a policy that depends on it.

The gap between the policy you want and the controls you have is where most problems start. If your plan applies one setting to the whole workspace, a short period chosen for social channels will also erase engineering history.

Legal holds come before any deletion setting#

A legal hold suspends routine deletion for the people, channels and date ranges it covers, and it takes priority over every retention setting. Counsel issues the hold; IT makes sure the workspace and every connected tool actually honor it.

Deletion under a written, consistently applied policy, made before any duty to preserve arose, is generally viewed differently from deletion after a dispute begins. Whether a specific deletion was appropriate is a question for counsel, not for the admin console.

• 1Identify custodians, channels and date ranges with counsel, including departed employees whose accounts still hold messages.
• 2Apply the hold with Slack's own tooling if your plan includes it; otherwise pause the relevant deletion setting or take a preserved export.
• 3Check third-party archiving tools, scheduled scripts and bots that delete or edit messages automatically.
• 4Send hold notices to custodians and record who acknowledged them.
• 5Log every change to retention settings while the hold is open.
• 6Release the hold only on counsel's written instruction, then reapply normal settings.

Keeping too much versus keeping too little#

Keeping too much and keeping too little carry different costs, and a good policy names both. Over-retention widens what must be searched in discovery, enlarges what a breach could expose and makes privacy access requests harder to answer. Under-retention erases the record of why decisions were made.

Software companies tend to feel the second cost later. When an engineer leaves, the thread explaining a workaround may be the only record of it. When a customer escalates a recurring bug, the swarm channel shows how it was diagnosed. When the company is acquired, or considers licensing its operational records, that history is part of what gets assessed.

A workable rule: delete chatter deliberately, keep work conversations deliberately, and never let a storage or cost argument shorten retention on channels whose content nobody has reviewed.

Illustrative: a scheduling software company resets its policy#

Illustrative: a fictional software company that sells maintenance scheduling tools to trucking fleets runs Slack alongside Jira, Zendesk and Google Workspace. After a customer security questionnaire, the CFO proposes a single short retention setting for the whole workspace to reduce exposure.

The general counsel asks for a channel inventory first. IT sorts the channels into the eight types in the decision table and finds that the incident and escalation channels hold years of diagnostic discussion linked to Jira issues, while two recruiting channels hold candidate feedback that should never have been in Slack at all.

The company sets short retention for social channels and DMs, restricts and shortens the recruiting channels, and keeps engineering, incident and escalation channels longer. Before the new settings apply, IT exports the engineering and escalation history, verifies that the export opens and records the decision. A legal hold on account channels tied to a customer dispute stays in place, untouched by the change.

How SourceX looks at retained Slack history#

SourceX looks at retained Slack history as one possible record family, assessed on metadata before anything is shared. In the Supply step of the SourceX five-step transaction, a fit check asks which channel types exist, how far back they reach and what retention policy applies; no messages leave the workspace at that stage.

If a company proceeds, the Rights step typically excludes HR channels, most DMs and shared channels with unclear ownership, and the Preparation step removes personal and confidential details from what remains. The SourceX Evidence Packet records provenance, including the retention settings in force, along with permitted use, the privacy record and release authorization. Retention decisions should still rest on legal and business grounds first, since any licensing value is known only once a buyer engages.