Redundancy cost money, and most companies do not want to pay for it. I work for a company with about 40 employees. Our offices are connected to two different I

Redundancy cost money, and most companies do not want to pay for it. I work for a company with about 40 employees. Our offices are connected to two different ISPs: one by optical fiber and one by VDSL. We have two different telephone operators for our outgoing calls from the offices, and I have two mobile phones with different operators. During the last five years there have been multiple outages that lasted between minutes and days, but most of the times the redundancy have saved us. But when we lost power (the whole city went dark for hours) we went down when the batteries in the UPS was drained. Having our own generators is too expensive.