I too have syncthing replicating across 3 machines but its only usefull if you loose one machine. Recovery of old versions of docs is tricky. Syncthing does save versions but hunting fo old versions of files in hidden folders isn’t great. It would be great if you could browse file history via browser or the file manager, similar to what happens on Sharepoint.

I need to get more serious with backups. I read a lot about 4-3-1 and 2-2-1 but not sure i get it all. I need to find something that works with my truenas scale setup.