New submitter dwywit, anticipating World Backup Day, writes I've been asked to film this year's ANZAC services in my town. This is a big one, as it's the centenary of the Gallipoli campaign, and dear to our hearts here in Oz. The organisers have asked me to provide a camera-to-projector setup for remote viewing (they're expecting big crowds this year), and a recording of the parade and various services throughout the morning. Copies will go to the local and state library as a record of the day, but they would also like a copy to go into a time capsule. I have two issues to solve: 1. a storage medium capable of lasting 50 or 100 years and still be readable, and 2. a wrapper/codec that will be available and usable when the capsule is opened. I have the feeling that a conversion to film might be the only way to satisfy both requirements — it's easy enough to build a projector, or even re-scan the images for viewing. Has anyone got a viable alternative? Cloud storage isn't an option — this is going underground in a stainless steel container. See also this similar question from 2008; how have the options changed in the meantime?