A little script to backup your IOU Potts. Either pass the urls from command line or embed them in code at lines 45+. I made an example there. Works for iou.de and iou.ch

doBackup.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

__author__ = 'Jonas Gröger'

import argparse
import urllib.request
from urllib.error import URLError
from time import strftime
import os
from os import path

def download(folder, pott_url, append_to_filename=''):
  """
  Downloads the pdf from a pott url to the specified folder.
  The filename is a timestamp to which something is eventually added
  Returns 1
  """
  filename = strftime("%Y.%m.%d-%H:%M:%S") + append_to_filename + '.pdf'
  file = path.join(folder, filename)
  pott_export_url = pott_url + '/export/pdf/id/1'

  with open(file, 'wb') as out_file:
    try:
      result = urllib.request.urlopen(pott_export_url).read()
    except (URLError, ValueError):
      print("ERROR: Could not retrieve '" + pott_export_url + "'. Skipping...")
      os.remove(file)
      return 0
    out_file.write(result)
  return 1

if __name__ == '__main__':
  folder_to_save_pdfs = path.realpath(path.dirname(__file__))

  parser = argparse.ArgumentParser()
  parser.add_argument('pott', nargs='*', help="A url of type http://www.iou.ch/z6a8u1abc5ef1h")
  args = parser.parse_args()

  n_backed_up = 0
  if args.pott:
    for pott_url in args.pott:
      n_backed_up += download(folder_to_save_pdfs, pott_url)
  else:
    n_backed_up += download(folder_to_save_pdfs, 'YOUR IOU POTT URL', '_POTT_NAME')
    # n_backed_up += download(folder_to_save_pdfs, 'YOUR IOU POTT URL', '_POTT_NAME')
    # ...

  print('Finished backing up ' + str(n_backed_up) + ' potts.')