Dan, if you are getting an error using the patched version of duplicity,
can you please file a new bug with the logs and details the bug form
asks for?  It may be this bug, it may be something else.  I'll triage
separately.

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https://bugs.launchpad.net/bugs/1252484

Title:
  Possible data loss when restarting in the middle of a deleted file

Status in Duplicity - Bandwidth Efficient Encrypted Backup:
  Fix Committed
Status in “duplicity” package in Ubuntu:
  Fix Released
Status in “duplicity” source package in Lucid:
  Fix Committed
Status in “duplicity” source package in Precise:
  Fix Committed
Status in “duplicity” source package in Quantal:
  Fix Committed
Status in “duplicity” source package in Raring:
  Fix Committed
Status in “duplicity” source package in Saucy:
  Fix Released

Bug description:
  This was recently fixed in duplicity trunk.  But I'm filing a bug for
  paperwork purposes and for Ubuntu SRUs.

  [Impact]

  When restarting a backup, duplicity may accidentally skip the first
  65k chunk of one of the source files.  This means that when it is
  restored, it will be incomplete/corrupted, resulting in data loss.

  [Test Case]

  Download and install the 'test1.sh' file attached to this bug report, and run 
it like 'sh test1.sh'.  If it prints the following line, the bug is present:
  Binary files /tmp/source/newfile and /tmp/restore/newfile differ

  Or, follow these manual steps:
  mkdir /tmp/source
  dd if=/dev/urandom of=/tmp/source/bigfile bs=1024 count=5000
  # This next command will intentionally fail after the second volume!
  duplicity full /tmp/source file:///tmp/backup --vol 1 --fail 2 --no-encryption
  mv /tmp/source/bigfile /tmp/source/newfile
  duplicity full /tmp/source file:///tmp/backup --no-encryption
  duplicity restore file:///tmp/backup /tmp/restore --no-encryption
  # This next line will say the files differ if the bug is present
  diff /tmp/source/newfile /tmp/restore/newfile

  [Regression Potential]

  It's a relatively small patch, only affecting the specific case of
  restarting a backup when the file we were in the middle of is no
  longer there.  I'd say minor regression potential.

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