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+borg backup is pretty cool, and could be a great special remote backend.
+In particular it does delta compression and stuff.
+
+There seem to be two ways it could work. Probably there are borg commands
+that allow storing a given blob in it, and retrieving a given blob. And
+that could be used for a traditional special remote.
+
+But also, if a whole git-annex repository has been backed up with borg,
+then git-annex could look inside such a backup, and see if
+.git/annex/object/ contains an object. It could then mark it as
+present in the borg special remote. This way you'd use borg to take
+backups, and git-annex would then be aware of what was backed up in borg,
+and could do things like count that as a copy.
+
+--[[Joey]]