This document provides guidance on backing up critical data on Windows computers. It recommends backing up a minimum of once every 4 weeks, and more frequently for critical or current documents. Files to back up include documents, Outlook data, and Windows Mail. Suggested backup locations include USB flash drives, writable discs, and external hard drives. The preferred backup method is to copy and paste files using Windows Explorer. Specific instructions are provided for backing up documents, Outlook files like .pst and .dbx, and Windows Mail store folders. The Windows Backup and Restore Utility is also mentioned but not recommended for staff machines.