we copy all our pics locally to a NAS, and clone to a drive which we drop off at my parents twice a year; when we do the dropoff, we give them the latest backup

we copy all our pics locally to a NAS, and clone to a drive which we drop off at my parents twice a year; when we do the dropoff, we give them the latest backup drive and we take back their (less recent) drive. so, requires a home nas, and two backup drives, and an offsite person,