Simple DIY Cloud using Open Source

Servers:
Commodity x86 servers

Storage:
https://www.synology.com/en-uk/products/RS3617xs+#spec







Networking:



Virtualisation:
Open source Xen Server - only pay for optional support:
https://xenserver.org/
https://www.citrix.com/products/xenserver/
https://www.citrix.com/content/dam/citrix/en_us/documents/product-overview/citrix-xenserver-feature-matrix.pdf


Xen Orchestra:
https://xen-orchestra.com/#!/



Alternatively, Debian/KVM based Proxmox:
https://www.proxmox.com/en/

Colocation:
https://www.serversaustralia.com.au/colocation-australia.php
High quality data centre with low latency (sub 1 ms) to public cloud vendor....so can use higher order services and DR:



$240/month for cross connect cable in Equinix, no additional charge for traffic between colo server <--> AWS.

Hybrid cloud can be cheaper than public cloud, yet can still use public cloud for DR and higher order services:
https://blog.serverdensity.com/cloud-vs-colocation/