Of these, I can recommend Proxmox. Its a decent learning curve coming from VMware, but once you learn the interface you’ll be able to configure things much like you would in Vsphere/ESXi.
I recently started using the Proxmox Backup Server as well, and its pretty amazing. I got myself a super cheap VPS with 400gb storage, setup wireguard and installed the backup server. You just point Proxmox directly to it and it’ll do encrypted backups, scheduling, and easily keep any number of versions of your backups.