Way back when RNAV for light aircraft was the Bendix/King KNS80 rho-theta system, keeping current charts was easy. For 20 bucks and a stop at the local FBO, you replaced all your data: One sectional, the local approaches, an A/FD and an enroute chart or two.
If you were a serious traveler, price, weight and hassle escalated if you paid a premium to get updates mailed to you—in big packs or neat little envelopes—so you always had the latest charts.