There is a now Google has launched Takeout service that allows you to save and retrieve much of their personal data. Since today, download all YouTube videos is possible.
This is a good step towards the release of data Google has done in launching this service for others to download from an archive of its contacts, circles, flows, documents, profile or videos.
By going to google.com / takeout, we can indeed choose to download all data from all services supported or manually select services.
Service indicates the approximate number of files and the estimated size, service by service, before starting the creation of an archive that can take some time depending on its size.
All records, even those that are still being generated, can be found in the Downloads section and are available for download for one week.
In the same vein, Facebook also offers to download an archive of personal data consisting in particular of its publications, photos or videos and messages. Moreover, all services and social networks should offer this option.