

Look into BTRFS. I’ve been using it for a few months now and it’s awesome. Live disk images with delta changes (saving on consumed space and backup time), even with encrypted drives, and it’s used extensively by Google and Amazon so it will very likely be supported and maintained for a long time to come.
I personally use btrbk with a custom built systemd service and timer. Right now it’s very specific to my infrastructure, but if enough people request it and I have time and opportunity, I’ll post a generic solution here as soon as I can