I mean they should, film can get damaged too. The reason they don't are probably because it would be too expensive, bulky and film is single-use so also wastefu

I mean they should, film can get damaged too. The reason they don't are probably because it would be too expensive, bulky and film is single-use so also wasteful. Even hobby level DSLRs have two card slots with option to write to both. Professional cameras have tons of gear strapped to them, a second drive or some link to external storage is a no-brainer.