There are so many interconnected services these days it is almost impossible to have a backup for everything. For example if your EFTPOS service is down you can’t take a lot of payment. Same if your phone service is dead no one can call you. Have you considered that your email might be down?
We are moving through our lives taking things for granted. This is the healthy way to live not living in constant worry or fear. I really do think that we must be aware of what we are relying on. Beyond that we absolutely cannot replicate some items.
At a business level, make sure all critical services have as limited reliability on others as possible or that would cause such outages to definitely come up in news. This tends to mean that you can’t rely on a lot of intermediate wholesalers and unfortunately also on many startups who haven’t thought through this process. You can’t have a backup for everything, just make sure you know what these are.