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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 5"""
+ date="2017-07-10T18:15:02Z"
+ content="""
+Using trees like that would not work well in a distributed setting
+where two repositories could be storing content on the same special remote.
+
+The per-remote trees could be stored, by eg grafting them into the
+git-annex branches's tree under the uuid of the special remote.
+
+But, there could then be merge conflicts, when different trees have been
+exported to the same special remote concurrently. And there's no way to
+resolve such a merge: If repo A uploaded F containing K and B uploaded F
+containing L, we don't know which file the special remote ended up with.
+If that happened it would have to delete and re-export from scratch.
+
+I think it's fine for exporting to only be able to be done from one
+repository. But, if a user tries to do the above, it needs to fail in some
+reasonable way, not leave a mess.
+"""]]