Online backup service Backblaze has put up a post on compatibility issues with Mojave. The latest macOS update’s security model introduces some complexity for Backblaze (in part because the service doesn’t use a traditional app model, running instead as a combination of preference pane and daemon process). Backblaze’s post details a workaround to get the software running on Mojave, but it’s definitely a bit technical.
Backblaze says it’s working on a better solution for this problem, but if you rely on the service, you may want to hold off before jumping on the Mojave train.
Hat tip: Six Colors member John