Sorry if I missed this in the docs, but how robust is the persistence? ie is it the disk that comes with a standard AWS VM? or is it a share backed by e.g. Ceph with multiple redundant copies?

Details coming in the next few weeks. The contents are regularly replicated to a disk cluster, though we have some more experimentation to do before we commit to exactly how frequently. This space has a lot of trade-offs, we believe we have found a new and interesting one.