Martin Hostettler reported that Obnam doens't properly choose file-ids and client ids: there can be collisions, resulting in badness. See the e-mail at:

http://listmaster.pepperfish.net/pipermail/obnam-support-obnam.org/2014-May/003018.html

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This may still happen, but it's not severe enough that I want to fix it. Format 6 is in maintenance mode where only serious bugs get attention, and the rest of my time goes into producing a bette format (which doesn't have this bug at all). done --liw