Started work on http://git-annex.branchable.com/todo/to_and_from_multiple_remotes/. It's going slow, I had to start with a large refactoring. So far, option parsing is working, and a few commands are almost working, but concurrency is not working right, and concurrency is the main reason to want to support this (along with remote groups).
Today's work was supported by Jake Vosloo on Patreon.