Configuring Slack Archiving

You can archive files, posts, and replies from direct conversations, group conversations, or workspace channels in Slack. To make archived Slack Enterprise and Slack Plus content in available, configure an IM Archiving job.

To perform searches on archived Slack content, configure and run an IM Indexing job first—see Configuring Slack Indexing. An Index Job is not required if you only want to archive Slack data for compliance reasons, and do not intend to search the data.
It is not necessary to create a policy to guide this job.