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Obnam seems to be storing metadata quite inefficiently. I did this:

* create a directory tree with about 1.3 million empty files
* back that up

The data is about 500 megs (directory entries); the repository is
about 82 gigabytes.

Where is the space used? Can we store it more efficiently and if we
do, does that have an impact on runtime?

--liw

Workaround: use compression.
Proper fixes are going to require FORMAT GREEN ALBATROSS. [[done]]  --liw