restic backup shell script with telegram error and success reporting

backup.sh

#!/bin/bash
source /root/.restic_keys

telegramSend() {
  message=$1
  telegramStatus=$?
  if [[ "$telegramStatus" != 0 ]]; then
    echo "Telegram failed to send message: $message"
  fi

  curl -q -X POST \
    -H 'Content-Type: application/json' \
    -d "{\"chat_id\": \"${TELEGRAM_CHAT_ID}\", \"text\": \"${message}\"}" \
    https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage

  telegramStatus=$?
  if [[ "$telegramStatus" != 0 ]]; then
    echo "Telegram failed to send message: $message"
  fi
}

checkOutput() {
  output=$($@ 2>&1)
  exitCode=$?

  if [[ $exitCode != 0 ]]; then
    telegramSend "RESTIC BACKUP ERROR:\n${output}"
    exit 1
  else
    echo -e "${output}"
  fi
}

echo "$(date) - Starting backup..."
checkOutput restic \
  backup \
  --verbose \
  --files-from=/root/.restic_files \
  --exclude-file=/root/.restic_exclude \
  --tag automated_cron

echo "$(date) - Running forget and prune..."
checkOutput restic forget --prune --keep-daily 7 --keep-weekly 4 --keep-monthly 12

success="$(date) - Backup finished"
telegramSend "${success}"
echo -e "\n${success}"