In QuickBooks Desktop follow these steps:
File --> Back Up Company --> Create Local Backup.
Save it now.
Choose File Save location - Remember this location as you will need to access it again shortly.
Default File name is fine.
QBD will do the work saving the backup in that location. This will take a few minutes.
After complete, find the file within the Explorer (Windows) or Finder (Mac) and forward to the appropriate email/folder/link.