They make user port carts with SD cards that basically function as hard drives these days (though I doubt they would be using them). There is also paper as a record which may meet any requirements they have.

They probably don’t and it’s just for pricing and printing receipts…

I guess they could record the sales using carbon copy receipt paper.

Realistically it only needs to hold info for the day. It’s a bakery. They just need to know how much money should be in the cash drawer.