Backup and Restore - Proxmox VE
https://pve.proxmox.com/wiki/Backup_and_RestoreIt works by performing a Proxmox VE live backup, in which data blocks are copied while the VM is running. If the guest agent is enabled ( agent: 1) and running, it calls guest-fsfreeze-freeze and guest-fsfreeze-thaw to improve consistency. A technical overview of the Proxmox VE live backup for QemuServer can be found online here.
Proxmox Backup Server
https://pbs.proxmox.com13.07.2021 · Proxmox Backup Server is an enterprise-class client-server backup software that backups virtual machines, containers, and physical hosts. It is specially optimized for the Proxmox Virtual Environment platform and allows you to backup and replicate your data securely.