I think an uptime monitoring service will be my back up idea. It is like a pizza business, you can always
find people who want pizza and who will rave about your pizza. Dominos and Pizza Hut are not a problem.
You will have a hard time attracting customers as most common marketing channels are very saturated.
*unless you're going to approach it from a unique angle AND have access to a customer base; even then, it won't be a walk in the park