I think the problem with digital is it's basically infinate!
The amount of times i've set up a system in Toddledo, Filemaker database, Dropbox folder system, Evernote, Outlook, Mindmanager, etc, etc, etc then jumped ship is shameful! With paper what is in your hand is what you have to work on, nothing can get 'lost' as you know it's in there somewhere and you just have to write a contents system to find important stuff. Backup is easy - just take photos of pages you have important stuff of - sync them to Evernote or what ever should you need them, quick and simple. Bottom line is it's all about doing, if you remove the 'glamore' from you notes and concentrate on the content you will get more done in less time.