4K Stogram - Add "Download beginning on date" feature or archive feature

It would be nice if 4K Stogram had a feature to either begin downloading from a certain date forward, or some sort of archive feature. To save disk space, I would like to be able to move some of my downloaded content to other locations. I don't want to unsubscribe from certain accounts, but I don't want to end up re-downloading all of the content again.