Nandroid saves your phone at its exact settings, so restoring it at that point will bring you to the exact spot when you backed it up. With MyBackup, you have to start all over, download the app, restore it, and sometimes it's not as reliable. I prefer Nandroid because it's just clicking a few buttons and it gets me exactly where I want, whereas MyBackup is great, but I usually have to re-download a few apps because it didn't restore properly.