[pas]

maybe non-volatile e-paper, which can be updated easily if things are up, and if the system is down it still works as well as the printouts

[anonymous8888]

updatable e-paper is going to be very expensive

[pas]

Compared to managing thousands of printers? And then the resulting printouts? Buying ink, changing the cartridges?

Technologically it seems doable. Big enough order brings down the costs.

https://soldered.com/product/soldered-inkplate-5-5-2%e2%80%b...

Of course the real backup plan should be designed based on the actual needs, perhaps the whole system needs an "offline mode" switch. I assume they already run things locally, in case the big cable seeker machine arrives in the neighborhood.

[rbanffy]

A small printer connected to the scanner should do.