EteSync Server VS org-caldav

Are you / have you considered leveraging postgres' row level security for this (row filtering)? Feels like a natural fit for ensuring the right subset of data gets to the right users https://www.postgresql.org/docs/current/ddl-rowsecurity.html

E2E encryption would also be nice to have, it could be worth having a look at https://www.etesync.com/ for inspiration

A few days ago I saw some guys in this community saying that they uses https://www.etesync.com/ in order to sync contacts between Proton + Thunderbird (Desktop) + Mobile. I haven't used it yet, but I saved the link.

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EteSync - Secure Data Sync (version 2.4.0): Secure, private and end-to-end encrypted calendar, contacts and tasks sync

The programs will allow me to sync both my Google and my Etesyc Contacts and Calendars. Etesync also needs Etesync-Dav installed on the desktop but that is well explained on Github.

There is https://www.etesync.com

For CalDAV there is org-caldav or khalel. For CardDAV there is khalel. In my experience, though, using these packages is kind of involved and not very satisfying.

- Org-Caldav

PS: I've asked a similar question before and I know of org-caldav, which still requires a CalDAV proxy and org-gcal, which only works for Google.

Yeah, thanks for mentioning this - that was indeed my plan. I’m using org-caldav successfully on one machine, but I’m finding it hard to run across multiple machines. https://github.com/dengste/org-caldav/issues/270

org-caldav for calendar sync

I have a few files that are specifically reserved just for calendar/todo syncs. Then I set them up with org-caldav.

Random example of someone dealing with it... :

I use org-caldav with emacs-calfw.

I have Org-Caldav partially working with davmail and Office365. (Yes my employer hates me and I have to use Outlook!) In Thunderbird items I create on the phone appear in Org-Mode. But for Org-Caldav items I create on the phone do not appear. Items created in Emacs Org-Capture in the todo.org file do appear in Outlook (and Thunderbird).