backup_mongo_dump_email_mailgun.sh

#!/bin/bash

# run cron job to backup 'test' database to 'email@example.com' at 01:00 every day
# 0 01 * * * bash /home/maciek/scripts/backup_email.sh test email@example.com

DB=$1
EMAIL_TO=$2

MAX_FILE_SIZE=50000 #Mailgun email size <= 50MB 
BACKUP_DIR="/var/backups/mongobackups"

MAILGUN_API_KEY="key-1234...."
MAILGUN_DOMAIN="emaildomain.com"

echo "Creating Mongo dump for '$DB' at $BACKUP_DIR"
mongodump --db $DB --out $BACKUP_DIR

echo "Compressing $BACKUP_DIR/$DB"
tar -zcvf $BACKUP_DIR/$DB.tar.gz $BACKUP_DIR/$DB

echo "Sending email to $EMAIL_TO"
FILE=$BACKUP_DIR/$DB.tar.gz
FILE_SIZE=$(wc -c <"$FILE")

# FILE is larger than MAX_FILE_SIZE
if [ $FILE_SIZE -gt $MAX_FILE_SIZE ]; then 
 
  # Copy to a filename that has today's date
  DATE=`date +%Y-%m-%d`
  cp $BACKUP_DIR/$DB.tar.gz $BACKUP_DIR/$DB-$DATE.tar.gz

  SUBJECT="File to large - $DB backup"
  MESSAGE="File size to large to attach. Check $BACKUP_DIR on server for a backup file"

  curl -s --user "api:$MAILGUN_API_KEY" \
      https://api.mailgun.net/v3/$MAILGUN_DOMAIN/messages \
      -F from="Backups <backups@$MAILGUN_DOMAIN>" \
      -F to="$EMAIL_TO" \
      -F subject="$SUBJECT" \
      -F text="$MESSAGE"
else

  SUBJECT="$DB backup"
  MESSAGE="Backup of $DB"

  curl -s --user "api:$MAILGUN_API_KEY" \
      https://api.mailgun.net/v3/$MAILGUN_DOMAIN/messages \
      -F from="Backups <backups@$MAILGUN_DOMAIN>" \
      -F to="$EMAIL_TO" \
      -F subject="$SUBJECT" \
      -F text="$MESSAGE" \
      -F attachment=@$FILE
fi