HA vs BC

From an article I’m working on, the difference between high availability and business continuance succinctly expressed:

Availability measures how much use we get out of a system before it fails, or between failures. Business continuance (BC) is different; it means being able to continue business operations (possibly with some degraded capacity) while a recovery operation is in progress. A simple example might help: if your building has an automatic emergency generator, that’s HA. If you have to bring in your own generator from home, that’s BC.