For "local" storage as supported by bup and ddar, yes. Generally for external remotes: not yet, AFAIK. http://git-annex.branchable.com/design/assistant/deltas/

For "local" storage as supported by bup and ddar, yes. Generally for external remotes: not yet, AFAIK. http://git-annex.branchable.com/design/assistant/deltas/ http://git-annex.branchable.com/design/assistant/deltas/ has some design thoughts, so I think it is planned.