Purpose of Radicale-DecSync

[ghost]

I am wondering, what is the advantage of using DecSync for calendar / contact synchronization between Android and Thunderbird?

If you already have a Radicale server running, can't you just use DAVx5 to synchronize directly with Radicale? I could see one advantage: If you are already using something like Syncthing, you do not need to expose Radicale and can keep access restricted to localhost. Is that it? Am I missing something?

[microbearsmb]

DecSync allows for decentralized synchronization of calendar/contacts. You can run a localhost (i.e. not port-forwarded or even discoverable locally) Radicale server, that only runs when the client computer does, and is only accessible from the computer it runs on. Radicale syncs to Thunderbird or Evolution, and this plugin syncs Radicale to a folder, which can be synced with Syncthing to other devices. This way you have a copy of all data on all devices, and any device can accomplish synchronization, not just the server.