Windows 10 1809 Update Bug.

[#1]

So it appears there is a problem with the Windows 10 October 2018 1809 update where people are losing important files like documents and photos as a result of its installation.

https://www.engadget.com/2018/10/08/microsoft-windows-10-missing-files-fix.

Apparently Microsoft has the tools to get you back on track, just give them a call

I have it installed and as yet haven't noticed any more files than normal going missing.

Microsoft wrote:

We have paused the rollout of the Windows 10 October 2018 Update (version 1809)* for all users as we investigate isolated reports of users missing some files after updating.

If you have manually checked for updates and believe you have an issue with missing files after an update, please minimize your use of the affected device and contact us directly at +1-800-MICROSOFT, or find a local number in your area https://support.microsoft.com/en-us/help/4051701/global-customer-service-phone-numbers. Alternatively use a different device to contact us at https://support.microsoft.com/en-us/contactus/ (link will vary according to country of origin).

If you have manually downloaded the Windows 10 October 2018 Update installation media, please don’t install it and wait until new media is available.

We will provide an update when we resume rolling out the Windows 10 October 2018 Update to customers.

[#2]

I think you have to be unlucky to get caught by this, I've updated just shy of 60 machines this week and all are fine (well, so far they are anyway...)