This year many students and teachers are using the iPad app, notarize. Noterize is a great tool for taking notes, downloading documents and PDFs from the cloud, and annotating, however it is not a cloud based app. When a student brings down a document to notarize or creates a new note in notarize it resides within the app. Notes are not stored in the cloud or synced like in Evernote, therefore if the app is deleted or removed from the device it will delete all of your notes.
Below is a video that explains how to backup your notarize notes to dropbox. This will give you peace of mind knowing that if notarize is deleted all of your notes will be backed up in dropbox.