I use repairable / upgradable products (MNT laptop, Fairphone cellphones) and I have stocked up on a few critical spare parts, just in case the manufacturers goes under.

Other than that, what I have going for me is that I’m a Unix old-timer desperately hooked on the command line. So I use Linux, an ultra-lightweight window manager and zero graphical fluff. And I prefer old games 🙂 So my memory needs are rather limited.