About Microsoft Office 365 Groups backup sets
You can back up and restore the following objects in Office 365 Groups:
• Groups — Office 365 Groups (or Unified Groups).
• Conversations — Conversations, threads, and posts, including attachments.
• Drive — SharePoint team site documents (or OneDrive documents), including drive folders.
• Events — Calendar events.
• Members — List of members.
• Notes — Notebooks in OneNote Online, including section groups, sections, and page contents.
• Owners — List of owners.
• Photo — Photo contents.
• Plans — Plans, plan details, buckets, tasks, and task details.
NOTE: Backup of reference attachments is not supported.