Does CalDav necessarily depend on the cloud?

I’m looking for ways to reduce my dependence on the cloud, and one obvious target is Google calendar.

I’m able to host my own calendar on a Synology NAS, and HA can access this using the the CalDAV integration, but I notice that the docs and the GUI refer to it as using the cloud.

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Is this actually the case where the server is on the local network? I wouldn’t have thought so - unless there’s something going on behind the scenes. :grin: