MySQL dump with telegram failure notification

mysql_dump.sh

#!/bin/bash -x

# database credentials
db_user=""
db_pass=""
db_name=""
db_host="" # e.g 127.0.0.1 or localhost

# FTP credentials
ftp_url=""  e.g ftp://ftp.example.com
ftp_user=""
ftp_pass=""

# Telegram config
telegram_token=""
chat_id="" # Admin or group chat id

# Backup credential and path
backup_password=""
backup_path="" # e.g /var/backup/

# Backup name config
backup_suffix=`date +%F`
backup_prefix="your_site_"


### Backup Section ####
#  Backup name generator
backup_name="$backup_prefix$backup_suffix"

# Create sql backup
mysqldump --lock-tables=false -u"$db_user" -p"$db_pass" -h"$db_host" $db_name > "$backup_path/$backup_name.sql"

# Zip and encrypt backup
7za a "$backup_path/$backup_name.zip" -tzip -p"$backup_password" -mem=AES256 "$backup_path/$backup_name"

# Delete sql file
rm -rf $backup_path/*.sql 


# Send backup to FTP server via curl
(curl -T "$backup_path$backup_name.zip" $ftp_url --user $ftp_user:$ftp_pass && \
rm -rf $backup_path/*.zip ) || \
( echo "error in bakckup $backup_name" && curl -sS -X POST https://api.telegram.org/bot$telegram_token/sendMessage -d"text=backup_error%20$backup_name&chat_id=$chat_id" )