Ran into the same, or similar, issue. It turned out the problem was
caused by insufficient permissions. Found a solution here
https://unix.stackexchange.com/questions/68079/mount-cifs-network-drive-
write-permissions-and-chown

Below is the error message I received. Would be helpful to the user if
the error returned stated that the destination was not writable.

Traceback (innermost last):
  File "/usr/bin/duplicity", line 1555, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1541, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1393, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1511, in do_backup
    full_backup(col_stats)
  File "/usr/bin/duplicity", line 572, in full_backup
    globals.backend)
  File "/usr/bin/duplicity", line 454, in write_multivol
    (tdp, dest_filename, vol_num)))
  File "/usr/lib/python2.7/dist-packages/duplicity/asyncscheduler.py", line 
146, in schedule_task
    return self.__run_synchronously(fn, params)
  File "/usr/lib/python2.7/dist-packages/duplicity/asyncscheduler.py", line 
172, in __run_synchronously
    ret = fn(*params)
  File "/usr/bin/duplicity", line 453, in <lambda>
    vol_num: put(tdp, dest_filename, vol_num),
  File "/usr/bin/duplicity", line 342, in put
    backend.put(tdp, dest_filename)
  File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 395, in 
inner_retry
    % (n, e.__class__.__name__, util.uexc(e)))
  File "/usr/lib/python2.7/dist-packages/duplicity/util.py", line 79, in uexc
    return ufn(unicode(e).encode('utf-8'))
 UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 37: 
ordinal not in range(128)

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https://bugs.launchpad.net/bugs/1776030

Title:
  Backup fails with "an unknown error"

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