@kaia I meant it like this: Since you don't have enabled versions on Syncthing, you can enable them and Syncthing will keep every version of the container as a new file and then maybe use a cloud service as a last resort, if Syncthing fails. The problem with this is, if you add two entries on two separate devices without syncing them in between. Syncthing should detect that changes were made on both sides and refuse to overwrite each other and display a conflict in the UI, but I'm not sure if I would trust it.

As for Git: Probably don't use it. Git doesn't like dealing with binary files and you would store every change ever made to your container, which is probably not necessary. Besides you would still have the same problem as with Syncthing.