I am now using Syncthing on 57 GB of data on my way to 200 GB. I also haven't organized or otherwise even looked at most of these files over the past many years. So eventually I will sync less, I hope. https://syncthing.net
I am setting up Syncthing to sync about 300 GB of data between two computers https://syncthing.net/
When it comes to my HP laptop running quickly and cool, Debian Stable is doing an excellent job
I just installed Syncthing on my Debian laptop and started the service automatically with systemd https://docs.syncthing.net/users/autostart.html#
The reason I have so many updates right now is the release of @Debian 11.5 https://www.debian.org/News/2022/2022091002