I got some servers coming, 1 of which i want to build as a Proxmox host.
Want to then deploy a K8s or maybe K3s cluster on it… if it works will get more server storage create a proxmox cluster.
server have a i335 processor, 32GB RAM, 4TB M.2S NVMe storage.
and access to odd 50TB storage accessible via 2.5GbE network.
G
I am running a 3 host Proxmox cluster on Lenovo m720q machines. They are quite capable, but does not have the networking or storage capability you speak of 
I run a few VMs and LXCs and have automated backup to a Proxmox backup server hosted on the same cluster with storage on a NAS.
I have no knowledge of the use of Kubernetes and have not looked into is as I believe it is a complicated setup for home/self hosted use.
My cluster runs so well that the one or two times I have had issues with it I had to research Proxmox again as I forgot how I set it up 
I happen to be doing allot of work on docker and docker compose, lab work, blogs etc, so a k3s or k8s cluster would be handy.
and then also being able to potentially move my unify controller from my truenass to this rather.
G
I also run a three node proxmox cluster on Lenovo Thinkcentre M700 tiny PC’s. I have a mix of VMs and LXC containers using high availability and CEPH shares. I too make backups on a seperate proxmox backup server (aging intel NUC) to a ZFS pool. The solution is very reliable with zero downtime.
I run docker containers on my Synology NAS.
which processor does the Lenovo Thinkcentre M700 run, and RAM ?
As I have the TrueNAS Scale already not thinking Ceph, can’t see the value… usage, but expect to figure out why it might make sense…
G
They have the Intel i3-6100T CPU @ 3.20GHz and 32GB memory. I bought them second hand (or third or fourth) on Carbonite for a steal.
I setup Ceph before I had the Synology NAS, for high availability. You already have the TrueNAS so Ceph wouldnt add value.