I get an error (Unable to copy initial project database files) when backing up a project. How can I fix this?

Question: I am having an issue when I try to backup a project. I get the following message: "Unable to copy initial project database files". How do I fix this issue without restarting my computer?

Answer: Create a new project and merge the problematic project into it by going to Project>Merge. Then create a backup from the newly merged project. This should solve the issue.