Pretty sure the Amazon vault lock offerings are essentially specific implementations of the broad idea of an immutable backup. Not disagreeing with you here, just saying this might not be an “or” situation.

Immutable backups are the “current hotness” in this space.

If it’s Disney without DRM it’s probably a bootleg DVD

Yeah, an already ripped DVD or a non DRM protected DVD, which is as difficult as copying files from a USB and why dd works here.

Yeah this won’t work with 99.9 percent of DVDs or Blu-ray because of the DRM and the way the drives behave, not sure why you’d even post this.