Calendar trash
A deleted or archived meeting can be recovered, in every calendar it was in, and nothing is erased on its own.

Deleting and archiving a meeting both send it to the same trash, where it can be restored or deleted for good. A meeting kept in Nextcloud leaves it too, and therefore Thunderbird and the phone, and goes back there on restore if nothing changed there in the meantime. One deleted in Nextcloud or Thunderbird lands in the trash as well. A series cut short comes back whole, and the trash sends no email.
Comparable to Google Calendar's trash, without the automatic purge after 30 days
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