Currently, it’s not possible to backup multiple Slack workspaces simultaneously, however, it’s possible to switch workspaces to backup. So you can backup your first workspace, then switch to the second one, then switch to the third one and so on.
1. Go to the Slack tab and press the “Reset Slack Authorization” button:
2. When you press the “Back up now” button, the app will ask you which workspace to backup:
Please let us know if you have any questions!