How much storage are you actually using? You could just split it between the r230s and set up zfs replication in proxmox.

It should have power monitoring in the idrac already.

A wiki would be great, since it allows user contributions and a familiar interface.

Not necessarily mediawiki, though. Or maybe something that allows people to submit individual options in a category and vote on them.

Get it running and set it loose!

Unattended-upgrades or dnf-automatic

https://jellyfin.org/docs/general/clients/codec-support/