Xandikos VS etesync-dav

Looks like you looking for CalDAV server, xandikos, baikal, cosmo, cyrus IMAP server supports calendars and contacts, davical, nextcloud/owncloud and bunch others if you would look for CalDAV servers

Git is a really great format for email archives, because it provides free duplication and compression via packfiles, although I think it is a tilting at windmills to try to map specific commits to emails. I explained my git/imap workflow in another comment here.

However, git is perfect for calendars. It is used as a backing store for these caldav servers:

https://github.com/jelmer/xandikos

Self-hosted xandikos in my case, but any CalDAV/CardDAV server works (Nextcloud, ...)

After looking for a long time and trying out different stuff, I ended up with xandikos. I use it together with thunderbird and davx5/davdroid, and have found that it works slightly better than radicale. I run it behind caddy in a podman container, but i think it's also possible to just apt install it.

You can download it and find instructions here: https://github.com/etesync/etesync-dav

That is where I got the package from: linux-amd64-etesync-dav on Github

etebase is an end-to-end encrypted synchronization backend that supports, among other things, tasks. I use etesync for android in conjunction with opentasks on android and etesync-dav as a caldav gateway (synchronized to thunderbird with tbsync and its caldav backend) on the desktop. The backed is rather easy to run as a container image.

There's the official EteSync DAV that works with Thunderbird. :-)

2) install this local bridge server locally on the computer where evolution is installed : https://github.com/etesync/etesync-dav

I am using etesync-dav on Linux. You have to follow this guide https://github.com/etesync/etesync-dav First, make sure etesync-dav works on your OS. Then you have to install the add-ons Tbsync and Dav for Thunderbird and enter your local dav server adress. After restarting the PC the syncing works fine for me.

I'm also using EteSync with the etesync-dav "bridge" for synchronising calendars and contacts (even though, that happens outside of ProtonMail; for me it was more important to have the sync working with Thunderbird and Android devices.

To use the etesync-dav bridge downloads available here: https://github.com/etesync/etesync-dav/releases

Use http://localhost:37358/ for both servers, your EteSync username as the username and the DAV password you got in configuration and running as the password.