Hi All, as an IT guy I wouldn't recommend buying comlex router configs. Cloud based is the way to go and prices are coming down. Get yourself a VPS and let the IT guys worry about it being up and running under an SLA.
If you insist on doing somethng at home then yes, you could do a NIC teaming on a server or do some complex router config that will take you weeks to work out, or you could stick to the basics and solve what you originally asked. There are plenty of uptime monitors online which will ping your service and drop an email if not there for x attempts but you will need to ensure you have a fixed IP which typically costs money in the UK.
VPS is very much the way to go for retail traders.... You want to spend your time Trading not becoming an IT professional...