BC Provincial Parks

Well I wouldn't say backward. A lot of the campgrounds are in areas that there is no internet or Wi-fi, so cash only. There are also a number of private campgrounds out there that don't take credit cards or debit cards.
As a rule when I travel I always have enough cash for a hotel for a night or two, food in a restaurants for a day or two as well as gas for a day or two.
Ya never know when systems can crash and the only way to buy something is with Cash.
Soup.