Adding par2 to existing storage fails (lp:#1646193)

[Original report](https://bugs.launchpad.net/bugs/1646193) created by **moredread (moredread)**
```
I tried to add par2 support to an existing backup storage (i.e. there are
already backups there), but it fails.

Using a new storage folder works fine. Not sure if my use case is
supported, but it'd be nice to be able to add par2 for newer backups.

Duplicity version: 0.7.10
Duply version: 2.0.1
Python version: Python 2.7.9
OS Distro and version: Debian stable
Type of target filesystem: Linux
Log output from -v9 option:

Start duply v2.0.1, time is 2016-11-30 18:33:51.
Using profile '/etc/duply/server-new-dh'.
Using installed duplicity version 0.7.10, python 2.7.9, gpg 1.4.18 (Home:
~/.gnupg), awk 'GNU Awk 4.1.1, API: 1.1 (GNU MPFR 3.1.2-p3, GNU MP 6.0.0)',
grep 'grep (GNU grep) 2.20', bash '4.3.30(1)-release (x86_64-pc-linux-
gnu)'.
Autoset found secret key of first GPG_KEY entry 'XXXXXXXX' for signing.
Checking TEMP_DIR '/tmp' is a folder and writable (OK)
Test - Encrypt to 'XXXXXXXX' & Sign with 'XXXXXXXX' (OK)
Test - Decrypt (OK)
Test - Compare (OK)
Cleanup - Delete '/tmp/duply.2276.1480527231_*'(OK)

--- Start running command PRE at 18:33:52.119 ---
Skipping n/a script '/etc/duply/server-new-dh/pre'.
--- Finished state OK at 18:33:52.158 - Runtime 00:00:00.039 ---

--- Start running command BKP at 18:33:52.185 ---
Using archive dir: /root/.cache/duplicity/duply_server-new-dh
Using backup name: duply_server-new-dh
Import of duplicity.backends.acdclibackend Succeeded
Import of duplicity.backends.azurebackend Succeeded
Import of duplicity.backends.b2backend Succeeded
Import of duplicity.backends.botobackend Succeeded
Import of duplicity.backends.cfbackend Succeeded
Import of duplicity.backends.copycombackend Succeeded
Import of duplicity.backends.dpbxbackend Failed: No module named dropbox
Import of duplicity.backends.ftpbackend Succeeded
Import of duplicity.backends.ftpsbackend Succeeded
Import of duplicity.backends.gdocsbackend Succeeded
Import of duplicity.backends.giobackend Succeeded
Import of duplicity.backends.hsibackend Succeeded
Import of duplicity.backends.hubicbackend Succeeded
Import of duplicity.backends.imapbackend Succeeded
Import of duplicity.backends.lftpbackend Failed: the scheme ftp already has
a backend associated with it
Import of duplicity.backends.localbackend Succeeded
Import of duplicity.backends.mediafirebackend Succeeded
Import of duplicity.backends.megabackend Succeeded
Import of duplicity.backends.multibackend Succeeded
Import of duplicity.backends.ncftpbackend Succeeded
Import of duplicity.backends.onedrivebackend Succeeded
Import of duplicity.backends.par2backend Succeeded
Import of duplicity.backends.pydrivebackend Succeeded
Import of duplicity.backends.rsyncbackend Succeeded
Import of duplicity.backends.ssh_paramiko_backend Succeeded
Import of duplicity.backends.ssh_pexpect_backend Succeeded
Import of duplicity.backends.sshbackend Failed: 'module' object has no
attribute 'ssh_backend'
Import of duplicity.backends.swiftbackend Succeeded
Import of duplicity.backends.sxbackend Succeeded
Import of duplicity.backends.tahoebackend Succeeded
Import of duplicity.backends.u1backend Succeeded
Import of duplicity.backends.webdavbackend Succeeded
Setting multipart boto backend process pool to 4 processes
Reading globbing filelist /etc/duply/server-new-dh/exclude
Main action: inc
================================================================================
duplicity 0.7.10 (August 20, 2016)
Args: /usr/local/bin/duplicity --name duply_server-new-dh --encrypt-key
XXXXXXXX --sign-key XXXXXXXX --verbosity 9 --gpg-options --compress-
algo=bzip2 --bzip2-compress-level=9 --personal-cipher-preferences AES256
--full-if-older-than 1M --volsize 100 --asynchronous-upload --s3-use-
multiprocessing --par2-redundancy 15 --exclude-filelist /etc/duply/server-
new-dh/exclude / par2+s3://objects-us-west-1.dream.io/foobar
Linux foobar 3.18.36 #1 SMP Thu Jun 30 15:35:47 CEST 2016 x86_64
/usr/bin/python2 2.7.9 (default, Jun 29 2016, 13:08:31)
[GCC 4.9.2]
================================================================================
Using temporary directory /tmp/duplicity-4qKW9b-tempdir
Registering (mkstemp) temporary file /tmp/duplicity-4qKW9b-tempdir/mkstemp-
Bh5MFV-1
Temp has 34918731776 available, backup will use approx 241172480.
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-full-
signatures.20151213T051406Z.sigtar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-full-
signatures.20160617T045203Z.sigtar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-full-
signatures.20160718T041406Z.sigtar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-full-
signatures.20160818T041405Z.sigtar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-full-
signatures.20161124T155241Z.sigtar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.manifest.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol1.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol10.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol11.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol12.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol13.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol14.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol15.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol16.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol17.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol18.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol19.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol2.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol20.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol21.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol22.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol23.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol24.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol25.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol26.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol27.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol28.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol29.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol3.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol30.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol31.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol32.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol33.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol34.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol35.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol36.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol37.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol38.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol39.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol4.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol40.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol41.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol42.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol43.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol44.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol45.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol46.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol47.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol48.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol49.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol5.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol50.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol51.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol52.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol53.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol54.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol55.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol56.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol57.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol58.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol59.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol6.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol60.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol61.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol62.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol63.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol64.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol65.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol66.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol67.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol68.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol69.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol7.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol70.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol71.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol72.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol73.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol74.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol75.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol8.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20151213T051406Z.vol9.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.manifest.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol1.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol10.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol11.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol12.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol13.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol14.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol15.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol16.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol17.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol18.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol19.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol2.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol20.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol21.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol22.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol23.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol24.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol25.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol26.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol27.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol28.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol29.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol3.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol30.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol31.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol32.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol33.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol34.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol35.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol36.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol37.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol38.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol39.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol4.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol40.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol41.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol42.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol43.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol44.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol45.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol46.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol47.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol48.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol49.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol5.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol50.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol51.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol52.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol53.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol54.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol55.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol56.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol57.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol58.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol59.difftar.gpg
Listed s3://objects-us-west-1.dream.io/foobar/duplicity-
full.20160617T045203Z.vol6.difftar.gpg

...


         Incremental         Fri Jun 24 06:14:04 2016                 1
         Incremental         Sat Jun 25 06:14:06 2016                 1
         Incremental         Sun Jun 26 06:14:04 2016                 1
         Incremental         Mon Jun 27 06:14:05 2016                 1
         Incremental         Tue Jun 28 06:14:05 2016                 1
         Incremental         Wed Jun 29 06:14:05 2016                 1
         Incremental         Thu Jun 30 06:14:05 2016                 1
         Incremental         Fri Jul  1 06:14:05 2016                 1
         Incremental         Sat Jul  2 06:14:05 2016                 1
         Incremental         Sun Jul  3 06:14:05 2016                 1
         Incremental         Mon Jul  4 06:14:05 2016                 1
         Incremental         Tue Jul  5 06:14:05 2016                 1
         Incremental         Wed Jul  6 06:14:07 2016                 1
         Incremental         Thu Jul  7 06:14:05 2016                 1
         Incremental         Fri Jul  8 06:14:06 2016                 1
         Incremental         Sat Jul  9 06:14:06 2016                 2
         Incremental         Sun Jul 10 06:14:05 2016                 1
         Incremental         Mon Jul 11 06:14:05 2016                 1
         Incremental         Tue Jul 12 06:14:05 2016                 1
         Incremental         Wed Jul 13 06:14:07 2016                 1
         Incremental         Thu Jul 14 06:14:05 2016                 1
         Incremental         Fri Jul 15 06:14:05 2016                 4
         Incremental         Sat Jul 16 06:14:05 2016                 1
         Incremental         Sun Jul 17 06:14:05 2016                 1
-------------------------

Secondary chain 3 of 4:
-------------------------
Chain start time: Mon Jul 18 06:14:06 2016
Chain end time: Wed Aug 17 06:14:05 2016
Number of contained backup sets: 31
Total number of contained volumes: 113
 Type of backup set:                            Time:      Num volumes:
                Full         Mon Jul 18 06:14:06 2016                79
         Incremental         Tue Jul 19 06:14:05 2016                 2
         Incremental         Wed Jul 20 06:14:05 2016                 1
         Incremental         Thu Jul 21 06:14:04 2016                 1
         Incremental         Fri Jul 22 06:14:05 2016                 1
         Incremental         Sat Jul 23 06:14:05 2016                 2
         Incremental         Sun Jul 24 06:14:05 2016                 1
         Incremental         Mon Jul 25 06:14:05 2016                 2
         Incremental         Tue Jul 26 06:14:05 2016                 1
         Incremental         Wed Jul 27 06:14:05 2016                 1
         Incremental         Thu Jul 28 06:14:08 2016                 1
         Incremental         Fri Jul 29 06:14:05 2016                 1
         Incremental         Sat Jul 30 06:14:06 2016                 1
         Incremental         Sun Jul 31 06:14:07 2016                 1
         Incremental         Mon Aug  1 06:14:05 2016                 1
         Incremental         Tue Aug  2 06:14:05 2016                 1
         Incremental         Wed Aug  3 06:14:05 2016                 1
         Incremental         Thu Aug  4 06:14:05 2016                 1
         Incremental         Fri Aug  5 06:14:04 2016                 1
         Incremental         Sat Aug  6 06:14:05 2016                 1
         Incremental         Sun Aug  7 06:14:07 2016                 1
         Incremental         Mon Aug  8 06:14:04 2016                 1
         Incremental         Tue Aug  9 06:14:05 2016                 1
         Incremental         Wed Aug 10 06:14:04 2016                 1
         Incremental         Thu Aug 11 06:14:07 2016                 2
         Incremental         Fri Aug 12 06:14:05 2016                 1
         Incremental         Sat Aug 13 06:14:06 2016                 1
         Incremental         Sun Aug 14 06:14:04 2016                 1
         Incremental         Mon Aug 15 06:14:05 2016                 1
         Incremental         Tue Aug 16 06:14:06 2016                 1
         Incremental         Wed Aug 17 06:14:05 2016                 1
-------------------------

Secondary chain 4 of 4:
-------------------------
Chain start time: Thu Aug 18 06:14:05 2016
Chain end time: Wed Aug 31 06:14:05 2016
Number of contained backup sets: 14
Total number of contained volumes: 94
 Type of backup set:                            Time:      Num volumes:
                Full         Thu Aug 18 06:14:05 2016                81
         Incremental         Fri Aug 19 06:14:05 2016                 1
         Incremental         Sat Aug 20 06:14:10 2016                 1
         Incremental         Sun Aug 21 06:14:13 2016                 1
         Incremental         Mon Aug 22 06:14:32 2016                 1
         Incremental         Tue Aug 23 06:14:05 2016                 1
         Incremental         Wed Aug 24 06:14:05 2016                 1
         Incremental         Thu Aug 25 06:14:05 2016                 1
         Incremental         Fri Aug 26 06:14:06 2016                 1
         Incremental         Sat Aug 27 06:14:09 2016                 1
         Incremental         Sun Aug 28 06:14:05 2016                 1
         Incremental         Mon Aug 29 06:14:05 2016                 1
         Incremental         Tue Aug 30 06:14:04 2016                 1
         Incremental         Wed Aug 31 06:14:05 2016                 1
-------------------------


Found primary backup chain with matching signature chain:
-------------------------
Chain start time: Thu Nov 24 16:52:41 2016
Chain end time: Wed Nov 30 17:38:31 2016
Number of contained backup sets: 2
Total number of contained volumes: 87
 Type of backup set:                            Time:      Num volumes:
                Full         Thu Nov 24 16:52:41 2016                85
         Incremental         Wed Nov 30 17:38:31 2016                 2
-------------------------
No orphaned or incomplete backup sets found.
Reuse configured PASSPHRASE as SIGN_PASSPHRASE
Registering (mktemp) temporary file /tmp/duplicity-4qKW9b-tempdir/mktemp-
EkZ084-2
Making directory /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting tree /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Selecting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Backtrace of previous error: Traceback (innermost last):
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
369, in inner_retry
    return fn(self, *args)
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
545, in get
    self.backend._get(remote_filename, local_path)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/par2backend.py", line 118, in get
    self.wrapped_backend._get(par2file.get_filename(), par2file)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 247, in _get
    self.pre_process_download(remote_filename, wait=True)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 298, in
pre_process_download
    self._listed_keys[key_name] = list(self.bucket.list(key_name))[0]
 IndexError: list index out of range

Attempt 1 failed. IndexError: list index out of range
Making directory /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting tree /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Selecting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Backtrace of previous error: Traceback (innermost last):
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
369, in inner_retry
    return fn(self, *args)
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
545, in get
    self.backend._get(remote_filename, local_path)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/par2backend.py", line 118, in get
    self.wrapped_backend._get(par2file.get_filename(), par2file)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 247, in _get
    self.pre_process_download(remote_filename, wait=True)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 298, in
pre_process_download
    self._listed_keys[key_name] = list(self.bucket.list(key_name))[0]
 IndexError: list index out of range

Attempt 2 failed. IndexError: list index out of range
Making directory /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting tree /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Selecting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Backtrace of previous error: Traceback (innermost last):
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
369, in inner_retry
    return fn(self, *args)
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
545, in get
    self.backend._get(remote_filename, local_path)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/par2backend.py", line 118, in get
    self.wrapped_backend._get(par2file.get_filename(), par2file)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 247, in _get
    self.pre_process_download(remote_filename, wait=True)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 298, in
pre_process_download
    self._listed_keys[key_name] = list(self.bucket.list(key_name))[0]
 IndexError: list index out of range

Attempt 3 failed. IndexError: list index out of range
Making directory /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting tree /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Selecting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Backtrace of previous error: Traceback (innermost last):
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
369, in inner_retry
    return fn(self, *args)
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
545, in get
    self.backend._get(remote_filename, local_path)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/par2backend.py", line 118, in get
    self.wrapped_backend._get(par2file.get_filename(), par2file)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 247, in _get
    self.pre_process_download(remote_filename, wait=True)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 298, in
pre_process_download
    self._listed_keys[key_name] = list(self.bucket.list(key_name))[0]
 IndexError: list index out of range

Attempt 4 failed. IndexError: list index out of range
Making directory /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting tree /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Selecting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Deleting /tmp/duplicity-4qKW9b-tempdir/duplicity_temp.1
Backtrace of previous error: Traceback (innermost last):
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
369, in inner_retry
    return fn(self, *args)
  File "/usr/local/lib/python2.7/dist-packages/duplicity/backend.py", line
545, in get
    self.backend._get(remote_filename, local_path)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/par2backend.py", line 118, in get
    self.wrapped_backend._get(par2file.get_filename(), par2file)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 247, in _get
    self.pre_process_download(remote_filename, wait=True)
  File "/usr/local/lib/python2.7/dist-
packages/duplicity/backends/_boto_single.py", line 298, in
pre_process_download
    self._listed_keys[key_name] = list(self.bucket.list(key_name))[0]
 IndexError: list index out of range

Releasing lockfile /root/.cache/duplicity/duply_server-new-dh/lockfile.lock
Removing still remembered temporary file
/tmp/duplicity-4qKW9b-tempdir/mktemp-EkZ084-2
Removing still remembered temporary file
/tmp/duplicity-4qKW9b-tempdir/mkstemp-Bh5MFV-1
--- Finished state FAILED 'code 50' at 18:36:01.605 - Runtime 00:02:09.419
---

--- Start running command POST at 18:36:01.650 ---
Skipping n/a script '/etc/duply/server-new-dh/post'.
--- Finished state OK at 18:36:01.689 - Runtime 00:00:00.038 ---
```

Story points: 6.0