The DB and System Backup module backs up your Database, modules, skins and Profile Media on a daily basis to Amazon S3.
Requires system() access to mysqldump to work properly, as well as a working Amazon Web Services account:
The DB and System Backup module uses Reduced Redundancy storage on S3 to lessen backup storage costs.
the DB backups are on a 7 day rotation, so after a week there will always be 7 copies of the database tables.
For the data, if the file already exists on S3 and has not been changed in JR, it is not copied back up. The data backup is not "rotated".