The following guide explains a method for converting a Digital Ocean Droplet to a VMDK which can be used under VMware ESXi Hypervisor or other virtualization software.
This process is one way. It is currently impossible to convert a VMDK to a Digital Ocean Droplet.

View it here (pdf)!

Mario Loria is a builder of diverse infrastructure with modern workloads on both bare-metal and cloud platforms. He's traversed roles in system administration, network engineering, and DevOps. You can learn more about him here.