our use of the term "bucket" is ambiguous

[davidsarah]

We use "bucket" inconsistently to refer to either the collection of shares on a storage server with a given storage index, or the container for a single share.

When we add the S3 backend, there will also be a collision with S3's use of "bucket", meaning a collection of objects that has its own key namespace and is subject to a given access control and geographical region policy. That will probably will not correspond to a bucket in either of our senses.