We've been using WAL-E for about 4 years and it has worked well for us. One way to continuously test that your files are being pushed up correctly is to have a

We've been using WAL-E for about 4 years and it has worked well for us. One way to continuously test that your files are being pushed up correctly is to have a hot standby pulling WAL files from S3 and check periodically that the data in the standby looks sane. Although not a replacement for full "restore from backups" tests (because that process involves a base backup too), it's a good way to quickly notice issues preventing WAL files from being stored on S3 or from being decrypted.