By default, Slack will keep all messages for the life of your workspace. Workspace owners and organization owners can change retention settings for individual public channels. If allowed, members can also set a custom message retention period for the private channels and direct messages (DMs) they are a part of.Slack does not archive deleted messages or provide a way to recover deleted information. Once a user deletes a particular message, that message disappears forever. However, Slack can still retain deleted message information that can be included in an electronic tracking export.