Thanks for providing us the full details of your concern, Davep007.
To protect your file from ransomware virus, we need to ensure we set up the Windows Firewall and security settings on your computer. If you need some assistance with this one, it would be best to contact your IT personnel. They'll review the QBW file and check if there's no damaged component on it. They'll also help you scrub the QBW file to make sure it is not infected with the virus.
On the other hand, we offer the Intuit Data Protect backup service that works with QuickBooks. This backup service helps you protect your files and folders when saving them om your computer.
For more details about this one, you can check out these articles:
Please know I'm always available here if you need a hand with running your business in QuickBooks. Have a great day ahead.