Excel would be one option. There are also a couple of modules to do .csv imports. See for instance https://marketplace.mendix.com/link/component/1911 or https://marketplace.mendix.com/link/component/108605 . Depending on how much data it is these modules might be better suited.
Other option would be to create a webservice. Then if you run the model on your local machine with the right backup push the data to the cloud environment. Then do the restore local of the other database and push that data also.