I used this snippet to backup some files from my server to Yandex Disk

YaDisk.py

# coding: utf-8
#!/usr/bin/env python
#
# Based on https://github.com/TyVik/YaDiskClient
# Author: Kirill Vasin
import json
from requests import request
import os

disk_cred = ("user", "password")
FAILED_FOLDER = "failed_to_save"

def failover_action(prepared_data, path):
    if not os.path.exists(FAILED_FOLDER):
        os.makedirs(FAILED_FOLDER)
    fail_file = os.path.join(FAILED_FOLDER, os.path.basename(path))
    with open(fail_file, 'w') as outfile:
        outfile.write(prepared_data)


class YaDiskException(Exception):
    """Common exception class for YaDisk. Arg 'code' have code of HTTP Error."""
    code = None

    def __init__(self, code, text):
        super(YaDiskException, self).__init__(text)
        self.code = code

    def __str__(self):
        return "{code}. {message}".format(code=self.code, message=super(YaDiskException, self).__str__())


def send_data(user, data, path):
    """
    data should be JSON serializable
    """
    prepared_data = json.dumps(data)
    headers = {"Accept": "*/*"}
    url = "https://webdav.yandex.ru/" + path
    resp = request("PUT", url, headers=headers,
                   auth=disk_cred, data=prepared_data,
                   timeout=5)
    if resp.status_code != 201:
        failover_action(prepared_data, path)
        raise YaDiskException(resp.status_code, resp.content)