I’ve made a system of using Plotter ring journals a week at time and then running them through my scansnap into Keep It on my Mac. Keep It uses the native Apple handwriting recognition, which is shockingly quite good. Then I clip them together and put them into a monthly accordion file made for storing canceled checks. Works really well for me!

I feel like those who write journals need to be familiar with rewriting.

My main, ephemeral journal, that I carry with me is just information I'm thinking about today, and is at most relevant within the past month or so. If I know that information is more important, I copy it out into a longer-term journal.

Anything that deserves more long-term protection is a manual rewriting process.

I was going to rewrite my handwritten journal into a journal app but gave up pretty quickly - my early journal was written during a pretty stressful time and reliving it was fairly unpleasant so I quit after getting the first month or two (re)written. Knowing that I had a major burnout coming up in the following journal made me realise that I don't actually want to go back to those times, so I think if I decide to have another go at backing things up, I'll just be scanning the pages to create digital copies, without having to read them.

I have sometimes toyed with the idea of buying a fire- and waterproof container for my finished journals. They are the most irreplacable objects that I value.

Does anyone have experiences with automatic handwriting recognition for digitalization?

Since you’ve already gone down the fountain pen rabbit hole, you could also take a look at “archival quality” or “water proof” inks. Many other inks can fade or be washed away, so even though you may love your J. Herbin Bleu Pervence, it might not be the kind of ink that lasts decades.