HOW TO: Backup or locate your Opus configuration (Advanced) goes into detail on the different configuration folders and files.
Restoring the whole main config folder from your backup is probably the easiest thing to do. You can find the folder's location by typing /dopusdata into Opus's location field and pushing return.
That is assuming the backup was made before the disk became corrupted, and that you want to restore everything to how things were at the time of the backup.
Before restoring any config files by hand, be sure to fully exit Opus (via File / Exit Directory Opus), and do the copy using Explorer (or something other than Opus itself). This is because some configuration files are read when Opus starts, or overwritten when it exists, and changing them when it is already running won't always work.