Backup to server is failing

Hello,

I replaced a few months ago a server in my proxmox cluster (3 servers, proxmox backup server not included)
At first sight, everything seems to be running OK, unless I try to do a backup for some vm's / containers.

The error I get:
ERROR: VM 125 qmp command 'backup' failed - backup connect failed: command error: backup owner check failed (root@pam != backup@pbs)

(I have no idea where I could change this behaviour, tried looking in the config files on the servers...

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