The configuration is all stored in files, so you can do more granular backups by copying selected files/folders between machines.
HOW TO: Backup or locate your Opus configuration (Advanced) goes into the different config folders in detail.
Note that some config files are only saved when Opus exits, or only loaded when Opus is launched, so you may need to fully exit Opus (e.g. via File / Exit Directory Opus) before manually copying the files, depending on which they are.