ORB and ZIP are magnetic storage.
Magnetic media is reasonably stable for a few years, but no magnetic media is safe for archiving.
If you use an 8x Plextor PlexWriter, burning one doesn't take long. I tend to walk softly around the machine when it's burning a CD, but that's a habit from the days when any vibration turned a CD blank into a coaster. They have the advantage of being rewritable, and lately the media price has fallen. I don't like them. In the first place, they take about an hour to format.