Whether students work in cloud-based platforms or take pictures of analog notes, technology lets them save their work indefinitely.
I once had a wonderful advisee. Every afternoon, we repeated this routine.
Find his planner.
Find his notebooks.
Make sure that he could find his notes in said notebooks.
Put the notebooks into his backpack.
When we finally got this child a laptop, everything changed. He typed all of his notes in Google Docs so that he could access them from any device and from anywhere. Suddenly, everything was truly saved.