Extremely simple script to list and backup all your MySQL dbs to Amazon S3 using s3cmd (http://s3tools.org/).

db-backup.sh

#!/bin/bash
dblist=`mysql -u root -pYOURPASSWORD -e "show databases" | sed -n '2,$ p'`
for db in $dblist; do
        if [ $db != 'performance_schema' ] && [ $db != 'mysql' ] && [ $db != 'information_schema' ]
        then
                mysqldump -u root -pYOURPASSWORD $db > /var/backup/db/$db.sql
                s3cmd --no-progress --mime-type="application/octet-stream" put /var/backup/db/$db.sql  s3://YOURBUCKET/backup-db/$db.sql
        fi
done