"Cloud backup is incomplete" message - any cause for concern?

Yes, it is a cause for concern, as it means that you have an incomplete cloud backup, so in the unfortunate event that something happens to your existing hub, you may not be able to fully restore the backup on a new hub. If you update to the latest version released yesterday, we have added additional messages to better inform you which part of the backup failed. Further investigation will be required to identify the root cause of the failure, depending on the component that fails.