I've been using command-line git for data backup to a RPi over SSH, once it's set up it's pretty easy to stay on top of, and then everyone once in a while rsync

I've been using command-line git for data backup to a RPi over SSH, once it's set up it's pretty easy to stay on top of, and then everyone once in a while rsync both the local storage and the RPi to separate USB drives. Also, every 3-6 months or so, rsync everything to a new USB drive and set it aside so that something like a system-wide ransomware attack doesn't corrupt all the backups.