I implemented Duplicati as a fast, easy and adaptable backup solution at my workplace. It’s itself running as a docker stack on every node in the swarm. Even migration to new servers is possible, because it can restore file permissions and ownership too. Just give it access to either the volumes path of the host or just the whole host file system.
Can be accessed via web interface, password protected. I actually recommend the image by the linuxserver community instead of the “official” for a simple, no-config deployment that starts up in seconds. Just add a data volume and your host bind in your compose file and that’s pretty much it.
It uses amazingly low resources while gaming. Never had such a thing on Windows back then.