Couldnt you just make daily snapshots on baremetal? Like most configs will support a ZFS pool.
All my stuff is just configs anyway, so my backup is a Git commit. Lighter than a full snapshot. My server can be restarted with like 50mbs of information.
Docker images are images so disposable. All my files and databases are on my NAS which is a ZFS pool mirrored and with a weekly backup to a secondary NAS also mirrored. Plus I have an offsite cloud backup of everything. There isnt really anything on my server that matters other than some configs, scripts and ymls. Which by commiting to my Gitea, are all on my NAS with the rest of my data.
I still feel like Proxmox just invites you to tinker and fiddle with stuff that should be set and forget. Or overcomplexify your setup with too many moving parts.
For public stuff I just use a VPS. Better internet connection than at home, high availability and DDOS protection. Otherwise, an LXC with good firewall rules and a well configured reverse proxy should be sufficient.
Hyper scalers have so little for their models and compute to do they are just brute force hacking things or mining crypto.