It's possible that the last incremental was corrupted.  Try this:

- duplicity cleanup --force <target>
- remove the last incremental backup, easiest is by date in the filename
- duplicity inc -v9 <source> <target>

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https://bugs.launchpad.net/bugs/1612554

Title:
  duplicity backup fails with OverflowError: size does not fit in an int

Status in Duplicity:
  In Progress
Status in duplicity package in Ubuntu:
  New

Bug description:
  Ubuntu 14.04.4 LTS
  duplicity 0.6.23-1ubuntu4.1
  python2.7 2.7.6-8ubuntu0.2

  Backup command used:
  duplicity --exclude-filelist "/root/.duplicity_excludes" --full-if-older-than 
7D --log-file "/var/log/duplicity" --no-encryption --volsize 100 / "$S3BUCKET"

  Backups have been running fine for several months, but since last
  night it started giving following error:

  ---

  Reading filelist /root/.duplicity_excludes

  Sorting filelist /root/.duplicity_excludes

  Local and Remote metadata are synchronized, no sync needed.

  Last full backup date: Sun Aug  7 23:30:02 2016

  Traceback (most recent call last):

    File "/usr/bin/duplicity", line 1494, in <module>

      with_tempdir(main)

    File "/usr/bin/duplicity", line 1488, in with_tempdir

      fn()

    File "/usr/bin/duplicity", line 1337, in main

      do_backup(action)

    File "/usr/bin/duplicity", line 1470, in do_backup

      incremental_backup(sig_chain)

    File "/usr/bin/duplicity", line 637, in incremental_backup

      globals.backend)

    File "/usr/bin/duplicity", line 405, in write_multivol

      at_end = gpg.GzipWriteFile(tarblock_iter, tdp.name,
  globals.volsize)

    File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 383,
  in GzipWriteFile

      new_block = block_iter.next()

    File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line
  518, in next

      result = self.process(self.input_iter.next())

    File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line
  213, in get_delta_iter

      (new_path, sig_path, sigTarFile))

    File "/usr/lib/python2.7/dist-packages/duplicity/robust.py", line
  37, in check_common_error

      return function(*args)

    File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line
  134, in get_delta_path

      delta_path.setfileobj(librsync.DeltaFile(old_sigfp, newfp))

    File "/usr/lib/python2.7/dist-packages/duplicity/librsync.py", line
  150, in __init__

      self.maker = _librsync.new_deltamaker(sig_string)

  OverflowError: size does not fit in an int

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