I am trying to set up an S3 backup for Informix 15 following this guide: 
https://www.ibm.com/docs/en/informix-servers/15.0.0?topic=cb-back-up-amazon-simple-storage-service-using-bar-psm

To follow this guide, you must create a credentials file. This creds file requires a specific structure and counting in with encryption (in both versions) - https://www.ibm.com/docs/en/informix-servers/15.0.0?topic=utility-creating-aws-type-keystore

I want to use an internal MinIO (S3-compatible storage solution). Because it is an internal system, backup (or generally any) encryption is not requested. Unfortunately, the keystore/creds file allows no option without encryption. In previous versions, it was possible to use the secret and access key directly, but in version 15, this option is not available anymore (https://www.ibm.com/docs/en/informix-servers/15.0.0?topic=manager-onpsm-utility-storage-management).

Does exist any option on how to configure S3 backup without encryption? 

The only way that comes to my mind is to mount the bucket as a mount point and perform a filesystem backup to that folder.

Thank you for any advice.