failed to backup

Good time, I ran into a problem that backup does not work on one of the 3 machines, after searching for information on the forums I tried to disable quemu agent - the problem persists. Attaching the system versions: pve-qemu-kvm: 8.1.5-6 qemu-server: 8.2.1 pve-manager/8.2.4/running kernel...

Hello to all. I'm new to the forum and sorry if I posted in the wrong section. I need help........... I have several proxmox installations from 1.9 to 4.4 and I am fully satisfied with everything. However on a 2-node server (4.1.1) I have backup issues (only one system that has problems)...