I just use a script on an systemd timer. Well two scripts on two timers really - one running daily, one weekly for different data. It's just a bunch of rsync commands copying folders to an hdd in my system and I reroute the output into a simple log file, mainly to verify if it ran at all. I am a bit paranoid about that. I can also run it manually whenever I want. Oh and some of the data I also rsync again to a smb cloud drive from Hetzner. I do not keep multiple versions and I delete remote files that have been deleted locally. It's just a 1:1 copy.
Oh and I use OpenSuse Tumbleweed so I have auto configured btrfs snapshots. Though I have not needed them yet and could not even say how I can use those. I figure that out once I need them.