I've been dabbling in this since 1998, It's almost always ISP and power outages that get you. There are ways to mitigate those (primary/secondary ISPs, UPSes,

I've been dabbling in this since 1998, It's almost always ISP and power outages that get you. There are ways to mitigate those (primary/secondary ISPs, UPSes, and generators) but typically unless you're in a business district area of a city, you'll just always be subject to problems