Here is a patch that implements compressing of duplicity archives using
lzma (i.e. xz). It requires python-lzma to be installed.

Please be aware that decompressing is not yet implemented, so there is
no way to restore such archives yet. Furthermore I have not tested this,
so be aware that you might lose data if you use it.

I would appreciate if someone could help test this. Moreover I still
couldn't figure out where in the code decompression is done, so I'd
appreciate hints in regard to that so I can implement the rest.

** Patch added: "duplicity-lzma-write.patch"
   
https://bugs.launchpad.net/duplicity/+bug/629357/+attachment/2259941/+files/duplicity-lzma-write.patch

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https://bugs.launchpad.net/bugs/629357

Title:
  [Feature Request] support xz for compressing volumes

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