I have a PBS installation that shows constant usage, around 10%, even in the absence of tasks.
Package version:
proxmox-backup: 3.4.0 (running kernel: 6.8.12-11-pve)
proxmox-backup-server: 3.4.2-1 (running version: 3.4.2)
proxmox-kernel-helper: 8.1.1
proxmox-kernel-6.8.12-11-pve-signed...