If the Preferences | Editor | Change History | Enable change history option is enabled CodeGuide keeps track of the most recent changes made to files and directories via Save, Save all, refactoring, delete, etc.
To access earlier revisions of a specific file you can use the File | Change history... menu entry to bring up the following dialog.
This dialog lists the most recent revisions of a file with the information on when and how the revision was created (i.e. changed externally, saved, through refactoring, etc.). The last entry represents the current revision found on disk. You can select an earlier revision and press the Restore button to restore this revision. Restoring an earlier revision is recorded in the file change history as well as the global change history.
You can specify how many revisions of a file are stored using the Preferences Dialog.