It would be really nice to be able to backup configuration to Amazon S3 instead of using FTP. We have implemented Liquidfiles to get rid of FTP as a file sharing solution so having to leave an FTP server behind just for configuration backup doesn't feel very good. Worked around this right now by using an SFTP -> S3 gateway running on AWS EC2 (our Liquidfiles instance does as well). The SFTP gateway is internal only and start/stop is triggered using a lambda so it is started only during the Liquidfiles backup window. But lots of extra setup and moving parts just to get backup to a storage medium that it doesn't require an additional server to function.