Going from a RPi4 with 1TB usb ssd to proxmox VM with gen6 i5, 32GB, 4TB NVME in a optiplex micro.

Proxmox is currently humbling me as I learn my way through it.

Nice one. I dove into Proxmox early this year. I snagged a used Lenovo ThinkCentre with similar specs. Definitely humbling, but it's brilliant.

Good luck! for me it was an straight forward dd command in linux to clone the 1TB on the 4TB, expand partition to occupy full drive, and plug into rpi to boot up without disk space errors to close channels and move funds.