Oak Backup: an alternative to Déjà Dup + S3
Did you know that Déjà Dup removed support for Amazon S3?
As of version 42, Amazon S3 is no longer supported in Déjà Dup. They decided to focus on more consumer-targeted cloud services such as Google Drive, instead of more-technical cloud storage services such as Amazon S3.
You should try Oak Backup if you are looking for an alternative to Déjà Dup + S3. Oak Backup is similar to Déjà Dup but it supports Amazon S3, it has a simplified UI and it stores your backups in plain files so they last forever.