What we back up:
Users
Channels
Threads
Messages
Attachments
Direct messages that the user has access to
What we don't back up:
Direct messages between other users
Channels that the user doesn’t have access to
Group membership & permissions
Workflows
Note: The reason that some of these data types are not backed up is because they are not made available in Slack's API. As soon as these data types are available through the API we will add them to the backup scope.