Downloading Stream Content

Hi All, 

Considering there is a new change coming soon that will delete any Stream Video after 21 Days. Im on the look out to download all the Video we current have (also special for backups). I can see a JSON gets generated when you navigate the https://web.microsoftstream.com/browse  the key is "downloadUrl":"https://aase-1-content.api.microsoftstream.com/api/videos/2 GUID details /Signature etc. 

Has anyone managed to already create a script that can retrieve this content and create a backup solution for Stream Videos?

Thank you