Possibility to mirror a folder from container filesystem to S3

Users sometimes need to keep computation results that are too heavy to be generated at each runtime or pushed to GIT. It is for instance the case for the outputs of machine learning process generated on a RStudio service.
MinIO on principle enables this through `mirror --watch` commands.
However, the following init file correctly instances Rstudio service : https://raw.githubusercontent.com/fBedecarrats/test_mirror_s3/master/utils/init-tests-mirror-tryagain.sh
But the data saved on the data folder doesn't get mirrored to the selected S3 destination.
Please tell me if this issue is not clear and requires more information. Thanks in advance.