(已失效)Vultr免费backup功能，如何实现自动定时快照？

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import requests
from requests import get
import re


class __RPC:
    def __init__(self, api_key, name):
        self.api_key = api_key
        self.api_info = None
        self.name = name
        self.errors = {
            200: "Function successfully executed.",
            400: "Invalid API location. Check the URL that you are using.",
            403: "Invalid or missing API key. Check that your API key is present and matches your assigned key.",
            405: "Invalid HTTP method. Check that the method (POST|GET) matches what the documentation indicates.",
            412: "Request failed. Check the response body for a more detailed description.",
            500: "Internal server error. Try again at a later time.",
            503: "Rate limit hit. API requests are limited to an average of 2/s. Try your request again later."
        }

    def api_info_initial(self):
        res = get("https://www.vultr.com/api/")
        html = res.text
        methods = (m.group(1) for m in re.finditer(r"<td>(POST|GET)</td>", html))
        names = (m.group(1) for m in re.finditer(r"/v1/(.*?)</a>", html))
        self.api_info = dict(zip(names, methods))

    def __getattr__(self, name):
        return eval("__RPC")(self.api_key, self.name + "/" + name)

    def __call__(self, **kwargs):
        if not self.api_info:
            self.api_info_initial()
        if self.name not in self.api_info:
            raise ValueError("The API is not exists.")

        if self.api_info[self.name] == "GET":
            res = requests.get("https://api.vultr.com/v1/" + self.name, headers={"API-Key": self.api_key},
                               params=kwargs)
        elif self.api_info[self.name] == "POST":
            res = requests.post("https://api.vultr.com/v1/" + self.name, headers={"API-Key": self.api_key}, data=kwargs)

        if res.status_code == 200:
            return res.status_code, res.text.strip()
        elif res.status_code in self.errors.keys():
            return res.status_code, self.errors.get(res.status_code)
        else:
            res.raise_for_status()


class Vultr:
    def __init__(self, api_key):
        self.api_key = api_key

    def __getattr__(self, name):
        return eval("__RPC")(self.api_key, name)

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from vultr import Vultr
vultr = Vultr("api_key")
status_code, resp = vultr.server.list()
print(status_code, resp)

# print的响应
# 200 {'15388455': {'SUBID': '15388455', ......}}

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from vultr import Vultr
vultr = Vultr("api_key")
data = {'SUBID': '15388455'}
status_code, resp = vultr.snapshot.create(**data)
print(status_code, resp)

# print的响应
# 200 {'SNAPSHOTID': '1e05b17c45fd6'}

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# 删除旧快照
status_code, resp = vultr.snapshot.list()  # /v1/snapshot/list
if status_code != 200:
    logger.error(u'获取快照列表失败' + str(status_code) + resp)
else:
    logger.info(u'成功获取到快照列表')
    data_list = list(json.loads(resp).values())
    data_list.sort(key=lambda x: x['date_created'])  # 默认时间排序，由近到远
    data_list_del = data_list[10:]  # 取超过30个之后的快照
    for data_del in data_list_del:
        data = {'SNAPSHOTID': data_del.get('SNAPSHOTID')}
        status_code, resp = vultr.snapshot.destroy(**data)  # /v1/snapshot/destroy
        if status_code != 200:
            logger.error(u'删除旧快照失败')
        else:
            logger.info(u'成功删除一个旧快照')

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# 自动创建快照
30 18 * * * /usr/bin/python3 /home/script/vultr-snapshot.py