Looking for some hardware raid cards and advice

[Phoinix]

I have an ESXi server that I want to redo with better protection. I am not really using a lot of space, and I don't have a nas on it. I just use a couple Nginx servers and a domain controller. My goal is to host my own express servers with redundant protection. Currently I run my express servers with Heroku, because I want 99%+ uptime and I don't feel comfortable enough yet with my current server as it doesn't have redundancy. 

 

Also side note: maybe someone will know; but with ESXi, if you use two machine running the same config, can't you use them in a redundant way? Like if vm1 goes down on server1, the vm1 clone will take over on server2?

 

Thanks