The free backup plugin called BackWPup can be used to save your complete installation, including /wp-content/, and push them to an external Backup Service like Dropbox, S3, FTP and many more. With a single backup .zip file, you are able to easily restore an installation. Its features are:

– Database Backup (needs mysqli)

– WordPress XML Export

– Generate a file with installed plugins

– Optimize Database

– Check and repair the Database

– File backup

– Backups in zip, tar, tar.gz, tar.bz2 format (needs gz, bz2, ZipArchive)

– Store backup to directory

– Store backup to FTP server (needs ftp)

– Store backup to Dropbox (needs curl)

– Store backup to S3 services (needs curl)

– Store backup to Microsoft Azure (Blob) (needs PHP 5.3.2, curl)

– Store backup to RackSpaceCloud (needs PHP 5.3.2, curl)

– Store backup to SugarSync (needs curl)

– Send logs and backups by email

– Multi-site support only as network admin