Dump each MySQL database and send its backup to Amazon S3. https://engineering.growella.com/automatic-database-backups-amazon-s3/

database-backup.sh

#!/bin/bash
#
# Backup local databases to Amazon S3.
#
# This script takes a single argument: an S3 bucket name with optional path.
#
# Usage:
#  database-backup.sh backup.example.com
#  database-backup.sh backup.example.com/some/path
#
# Based on https://gist.github.com/2206527

if [ $# -lt 1 ]; then
        echo -e ""
        echo -e "Error: You must specify an S3 bucket."
        echo -e ""
        echo -e "Examples:"
        echo -e "  backups.example.com"
        echo -e "  backups.example.com/some/path"
        echo -e ""
        exit 1;
fi;

bucket="s3://$1"

echo -e "Beginning database backup..."

# List all the databases
databases=`mysql -h localhost -u <<user>> -p<<pass>> -e "SHOW DATABASES;" \
        | tr -d "| " \
        | grep -v "\(Database\|information_schema\|performance_schema\|mysql\|test\|sys\)"`

# Feedback
echo -e "Dumping to \e[1;32m$bucket/\e[00m"

# Loop the databases
for db in $databases; do

  # Define our filenames
  filename="$db.sql.gz"
  tmpfile="/tmp/$filename"
  object="$bucket/databases/$filename"

  # Feedback
  echo -e "\e[1;34m$db\e[00m"

  # Dump and zip
  echo -e "  creating \e[0;35m$tmpfile\e[00m"
  mysqldump -h localhost -u <<user>> -p<<pass>> --force --opt --databases "$db" | gzip -c > "$tmpfile"

  # Upload
  echo -e "  uploading..."
  s3cmd put "$tmpfile" "$object"

  # Delete
  rm -f "$tmpfile"

done;

# Job is complete.
echo -e "\e[1;32mDatabase backup completed successfully!\e[00m"