Since moving all the media files to Amazon S3 we wanted to make sure we had a backup of the media files in a different location incase of a S3 corruption. We have setup Google Cloud Nearline Storage for archiving all media files.
The archival is setup to check for any modified files daily at 1AM CET (Central European Time). If any modified files are found on the S3 buckets it will copy the files over to the Google Cloud Nearline archival storage.
This setup provides further redundancy to our infrastructure.