ERROR: backup_complete_cb -5

[MaxxDamage]

hello. I'm trying to make a backup of the virtual machine in order to transfer it to another server, but I get an error:
INFO: status: 29% (157528358912/536870912000), sparse 2% (14449639424), duration 2989, 34/33 MB/s
ERROR: backup_complete_cb -5
INFO: aborting backup job
INFO: stopping kvm after backup task
ERROR: Backup of VM 717 failed - backup_complete_cb -5
INFO: Backup job finished with errors
TASK ERROR: job errors
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[fiona]

Hi,
please post the output of pveversion -v, qm config 717 and the full backup log (you can remove the INFO: status lines in the middle, but the beginning would be interesting).

The -5 is likely to indicate an I/O error (5 is the error number for EIO). The error could be on source (if reading from the VM's disk fails) or target (if writing to the backup target fails). I'd check in /var/log/syslog for additional messages around the time the failure happened and the health of the involved physical disks.