Ubuntuでバックアップに失敗する

Ubuntuをdeja-dup(デフォルトで搭載されているバックアップツール)でバックアップしようとしているのですが、以下のようなエラーが出て、バックアップに失敗してしまいます。

不明なエラーで失敗しました
Traceback (most recent call last):
  File "/usr/bin/duplicity", line 1532, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1526, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1380, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1508, in do_backup
    incremental_backup(sig_chain)
  File "/usr/bin/duplicity", line 662, in incremental_backup
    globals.backend)
  File "/usr/bin/duplicity", line 427, in write_multivol
    at_end = gpg.GzipWriteFile(tarblock_iter, tdp.name, globals.volsize)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 401, in GzipWriteFile
    new_block = block_iter.next()
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 523, in next
    result = self.process(self.input_iter.next())
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 195, in get_delta_iter
    for new_path, sig_path in collated:
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 286, in collate2iters
    relem2 = riter2.next()
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 354, in combine_path_iters
    refresh_triple_list(triple_list)
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 341, in refresh_triple_list
    new_triple = get_triple(old_triple[1])
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 327, in get_triple
    path = path_iter_list[iter_index].next()
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 239, in sigtar2path_iter
    for tarinfo in tf:
  File "/usr/lib/python2.7/tarfile.py", line 2508, in next
    tarinfo = self.tarfile.next()
  File "/usr/lib/python2.7/tarfile.py", line 2350, in next
    raise ReadError("unexpected end of data")
ReadError: unexpected end of data