Hello @Dan Lies
Thank you for reaching out on the community and telling us about your issue. I do apologize for the issue you're having. I'm wondering here what could be causing the issue. There's a chance it could be the the patch itself might not of installed properly so to start off here lets see if we might be able to fix the issue with a mondo patch. I'll leave a link down below.https://www.quicken.com/support/update-and-patch-20182019-release-quicken-windows-subscription-productOnce you've had a chance to try this let us know if you're able to get your backups working again. If not we'll see what we can try next.
Thanks,
Quicken Francisco