gmakhs you are going about this the hard/wrong way. If you insist on s3, backup to Enhance, and then send a copy to s3 of the latest snapshot. You can do this is with kopia and many other tools. I’ve posted before on these forums the steps to use kopia.
We find rsync is even better. There are posts from @cPFence with a link to a script that will backup your backups to another location.
Just some ideas…