Typing seems like it might take long enough that you'd put it off for risky intervals, especially if you start to view it as a tedious chore*.
Perhaps just dumping the pages onto a scanner or mastering the focus on a digital camera enough so you get legible photos?
That way you get a backup you can do on a regular easy basis and you can discard stuff that doesn't work and only spend your time typing up the things you want to keep. And you get to keep any sketches and miscellaneous jotted but not-particularly-coherent random notes you make.
* "Ugh, I wrote another 15 pages today. Carpal tunnel, here I come!"
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