These notes are very hard to backup
To back up those notes, you have to save them page by page. You need to think about if you would be devastated if you lost these notes. If the answer to that question is yes, then you should take class notes in a different app.
I recommend Evernote. It stores all your notes in the cloud, so if your tablet has an issue, and you need a loaner, you can simply logon to your Evernote account and all of your notes will be on your temporary tablet. This is not the case if you are using the "notebook" app that came with your tablet.
