I don't remember the details, and to be clear this was not with the most recent version of Etcd at all - it was quite a while ago. I think and hope that whatever the problem was is no longer an issue. It has certainly gotten a lot better. My point is mainly that it is way too young to be something to trust important data to. We didn't either - what we lost was a cluster configuration that we could recreate from a combination of backups and redoing a handful of operations, but at the time it was scary to see, and prompted us to be very careful about what we put into Etcd going forward.