For backup purposes, you can allow viewers to download the original uploaded videos of a collection or standalone videos. For instructions on enabling this for Share Links and Digital Deliveries, please reference the following article:
Alternatively, you can export a collection for offline viewing and provide it to the viewer. For more details on this feature, please reference the following article:
Also, in the future we will be adding a feature to our apps that will allow clients to download videos and collections to their local devices for offline use.