Minio error messages , hi Sylvain.
From what I see, the access denied errors originate on the Minio server side. Seems like there is a misconfiguration of some kind - the Minio software is not able to create a new file on the storage.
There are no settings in CloudBerry Backup that would affect permissions in this regard.
I guess the Minio service runs under an account that is not capable of (some) write operations.
There's also no special treatment for .ORF files or any other specific file format - not sure if the Minio software has any.
"no such file or directory" seems to be a consequence of failed write - Minio could not create a file so it could not find it later.