[eddieroger]

Clustering, migration, high availability, backups, Ceph integration, virtual networks as of recent, can do containers as well as VMs to name a few off-hand. The web interface is optional, too. You should check out their webpage for more.

[dizhn]

re: backups, their other product "proxmox backup server" integrates really well with the backup system they have in place. It can be run in a container on the proxmox host itself.