backup-trello.conf

# backup-trello
description	"regular background program processing daemon"

start on (local-filesystems and net-device-up IFACE!=lo)

setuid hendersont
setgid hendersont

env HOME=/home/hendersont
export HOME

exec /usr/bin/env python $HOME/.trello/trello_backup.py

backup_trello.py

import os, sys, json, glob, time
import datetime
from logging import getLogger, basicConfig
basicConfig(level='DEBUG')
log = getLogger('trello_backup')

import requests

export_url = 'https://trello.com/board/[[REDACTED]]/[[REDACTED]].json'
login_url = 'https://trello.com/login'
auth_url = 'https://trello.com/authenticate'
creds = {
  'user':'[[REDACTED]]',
  'password':'[[REDACTED]]',
  'submit':'Log In', 'returnUrl':'/'
}

HOME = os.environ['HOME']
PATH = os.path.join(HOME, '.trello')

def export():
    trello = requests.session()
    trello.get(login_url).text
    trello.post(auth_url, creds).text
    return trello.get(export_url).json()

def time():
    return datetime.datetime.now().isoformat()

def name():
    return "trello-dump-%s.json" % time()

def clean():
    now = datetime.datetime.now()
    paths = sorted(glob.glob(os.path.join(PATH, '*.json')))
    if len(paths) < 5: return

    for path in paths[:-5]:
        t_format = '%Y-%m-%dT%H:%M:%S.%f'
        str_time = (
          os.path.splitext(os.path.basename(path))[0].lstrip('trello-dump-')
        )
        dt = datetime.datetime.strptime(str_time, t_format)
        if (now - dt) > datetime.timedelta(weeks=2):
            os.unlink(path)
            log.info('deleted %s' % path)

clean()

RETRIES = 5
for i in xrange(RETRIES):
    try:
        data = export()
        break
    except:
        if i+1 == RETRIES:
            raise
        else:
            time.sleep(5)

with open(os.path.join(PATH, name()), 'w') as f:
    json.dump(data, f, indent=2)