I do a weekly full back of the root filesystems of my Linux desktop and wife's laptop machines (while booted from rescue media) to zfs snapshots on a home file server running freebsd using rsync. The server holds snapshots for the most recent five weeks. A script on the server watches for changes and synchronizes its copy of my desktop home directory and paperless-ngx archive with a luks encrypted filesystem backed by a regular file, splits the image file into 1MB chunks, and uploads the changed chunks since the previous week to a cheap vps using rsync (typically 2 to 4 GB out of 400 total). The image file is on an external SSD connected to the server in case I have to grab it and run. (I prefer luks and ext4 for external media to the bsd equivalents so the server uses an Arch Linux vm with raw drive passthrough.) A script on the vps synchronizes it with redundant copies on three independent cloud storage providers using rclone, one of which stores monthly snapshots for the most recent seven months. I've memorized the passwords for the cloud providers and can access them without 2FA. A script on my laptop watches the cloud storage providers for changes and synchronizes one of them using rclone to a local copy on a rotating basis, reconstructs the luks filesystem image, and checks the SHA1 sum. My laptop also dumps a copy of the image to an old-timey slow-ass external usb hard drive once per quarter that holds the most recent four quarters. Once a year I back up the paperless archive and selected important files to DVD.