from issue #2161 we found that there can be hundreds of thousands of models generated for a regression analysis. We were backing those up and the file sizes were getting quite large. I have removed them from backups. I think by default we should not save models that are not selected.

After generating the models, the user navigates away, unselected models get scrubbed.

In some cases users want to reference back to models that were unused. In that case we can add a "save for later" type feature that will allow some models to be saved.