Error verify Backup

I have a PVE with 4 VM and 2 CT. The four VM are four WS2022 with the same hardware settings, two are DC, one have the SQL server and the last is a DFS server. I have setup a PBS to manage the backup of the VM and when I backup them the task give no error.
The PBS provide one backup of the four VM in local and une on a NFS Datastore on a synology DS920+.
The problem is that when I verify the backup, the DFS server give everytime error that can't access some (2 or 3) chunck file.
Everytime...

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