You should have 3 copies of your data, on 2 different mediums, at least 1 one in a different location.

I strongly believe that in the same way you should have at least 2 alarm clocks, one of which is of a different type. I strongly believe that you should use your phone and a dedicated alarm clock. Apple has released bugs that caused the alarm clock not to run, or do so at a wrong time. Likewise it is always possible for your normal alarm clock to lose power or run out of battery.

Having both failures on the same day is a lot less likely.