Griddrive is not designed to backup system or program files, only your personal documents and data. The software automatically selects default folders during the initial setup however you can always modify the backup selection at any time.
Both the operating system and the programs running on it must be reinstalled in the event of a hardware failure and therefore backing up these have very little value in such an event.
In such a case you should reinstall your operating system from the discs provided by your manufacturer, and then restore your files from our servers.