Two different vendors if you can afford it. It's a bit of a hassle though.

movedx · on Feb 28, 2017

I like to stick to one, but I have seen some success stories with an AWS/GCE mix :-)

HashiCorp's Terraform makes it a lot easier to go multi Cloud, and abstracting away configuration of the OS and applications/state with Ansible makes the whole process a lot easier too.

cfieber · on Feb 28, 2017

Here is one success story:

https://cloudplatform.googleblog.com/2017/02/guest-post-mult...