Déjà Dup errors

Been happy with Déjà Dup until recently, when I have been getting this error:

Traceback (innermost last):
  File "/usr/bin/duplicity", line 1566, in <module>
    with_tempdir(main)
  File "/usr/bin/duplicity", line 1552, in with_tempdir
    fn()
  File "/usr/bin/duplicity", line 1401, in main
    do_backup(action)
  File "/usr/bin/duplicity", line 1522, in do_backup
    full_backup(col_stats)
  File "/usr/bin/duplicity", line 580, in full_backup
    globals.backend)
  File "/usr/bin/duplicity", line 437, in write_multivol
    globals.volsize)
  File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 385, in GPGWriteFile
    data = block_iter.next().data
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 520, in next
    result = self.process_continued()
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 711, in process_continued
    return self.tarinfo2tarblock(index, ti, data)
  File "/usr/lib/python2.7/dist-packages/duplicity/diffdir.py", line 490, in tarinfo2tarblock
    return TarBlock(index, "%s%s%s" % (headers, file_data, filler_data))
 MemoryError