anamethatisnt , 3 months ago

You setup Proxmox Backup Server on separate hardware and then you add it as a storage option in your Proxmox Virtualization Server.
I haven't dived into it but I imagine you could run the Proxmox Backup Server as a VM in your Synology NAS.
https://www.proxmox.com/images/download/pbs/docs/proxmox-backup-3-1.pdf

edit: Unofficial PBS Docker github: https://github.com/ayufan/pve-backup-server-dockerfiles