As a Workspace Owner on the Slack Business+ plan, you need to set message retention...

Slack recommends setting a global policy and making specific exceptions where needed:

"Setting a shorter global retention policy and then setting exceptions to keep important messages longer in specific channels gives you flexibility while controlling overall data retention."

Default settings (B) would not provide an organization-wide policy. Allowing members to manage private channel retention (C) can be risky. Setting public retention short and private channels to everything (D) doesn't align with best practices for most businesses.

(Reference: Slack Administration Study Guide - Message Retention and Exceptions)

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