Encrypt then backup to Telegram. Used to backup mailcow and other things

encrypted-backup-to-telegram.py

import os 
import glob
from telethon.sync import TelegramClient

BACKUP_FOLDER="/your/backups/path"
KEY_FILE = "/your/key/path.txt"  # echo "yourpassword" > key.txt
API_ID = 12345  # Telegram API ID (https://my.telegram.org)
API_HASH = "qwertyuiopasdfghjklzxcvbnm"  # Telegram API hash (https://my.telegram.org)
BOT_TOKEN = "123456789:qwertyuiopasdfghjklzxcvbnmqwertyuiop"  # Telegram bot token (@BotFather)
DEST_ID = -1001234567890  # Destination chat ID (hint: use a private channel)

bot = TelegramClient('bot', API_ID, API_HASH).start(bot_token=BOT_TOKEN)

backups = glob.glob(BACKUP_FOLDER + '/**')
latest = sorted(backups, key=os.path.getctime)[-1] + '/'
encrypted_fn = latest.split('/')[-2] + '.aes256'
os.system(f"tar -czf - {latest} | openssl enc -e -pass file:{KEY_FILE} -aes256 -pbkdf2 -out {encrypted_fn}")
bot.send_file(DEST_ID, encrypted_fn, force_document=True)
os.remove(encrypted_fn)

# To decrypt: openssl enc -d -aes256 -pbkdf2 -in $FILENAME > real.tar.gz