The folder OPUSDATA have mdf and ndf files, those are not corrupted. Business have not reported any problems. The backup problems started after the disk was full. Another technician deleted...

I create the backup files on this server but backing up is made directly after that to another server. If it crash, I will only lose, less then one hours...

The path does not contain any mdf/ndfs files and the backups are not native. The database gets created first time when installing the software.

I found the folder, it was hidden but there is a permission problem with folder and files within it. It is not accessible, I forced to open folder with files...