Cheap Yet Secure Daily Backups For Database And Files

I need to make backups of a webapplication's MySQL database and some files for a client. Backups should be done on a daily basis and the whole system should be as cheap as possible - "ok, backups are important, but I don't want to spend any money on it anyway...". The backup should be fully automated. Furthermore installing an FTP server on one of the client's local machines (to upload the backups there) is not wanted, due to security concerns. Generally nothing of the existing setup should be changed, if possible. Finally security is a major concern - the backups' content is sensitive so making the data publicly available is nearly as bad as losing it.
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