To view the notes available on your backed up device, click "Notes" in the iBackup Extractor categories list; this will display the Note viewer.
You can select which note to read by scrolling through the available notes being displayed. Once selected, it will be shown on the right side of the application's window. Here you will be able to see when it was last modified, and the contents of the note itself.
Should you wish to save notes to your computer, select which notes to save on the listing and click the "Extract Notes..." button on iBackup Extractor. It will ask you where to save the notes (defaults to desktop) and proceed to save them as standard text (.txt) files.
On iOS based devices, notes are viewed using the "Notes" application on the device.