My partner and I have a shared calendar (read/write), and also share our personal calendars (read-only).

I started migrating from #NextCloud to #Radicale, but iOS threw a spanner in the works (turns out accountsd only checks for A and not AAAA DNS records!) I decided to go into a "half-migrated" state: pointing myself to the new instance to continue testing while leaving my partner pointing to the old one.

That caused a problem: any events we created in the meantime wouldn't be synced to the other's devices.

vdirsyncer came in super handy and enabled a three-way sync between NextCloud, Radicale and my laptop! So, despite being on two completely different #CalDAV servers, we both see exactly the same state and all updates flow through seamlessly. And, when they switch instance, it will be like nothing ever happened, despite being on different servers for a few weeks.

Thank you #openStandards and #freeSoftware!