The .NET Framework stores security policies in XML files. These files are backed up and restored as ordinary files. All these files have a .CONFIG file name extension. While several .CONFIG files exist on all systems, additional .CONFIG files may be created when applications are added or new trust levels are defined.
The files that have the extension .CCH are dynamically generated and do not have to be backed up or restored. You may find some files that have numbers appended to their .CCH extensions. When you try to make backups of these files, you may receive errors because the files are in use. You must not make backups of these files because these files are cache files.