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S3 Compatible VM backup using TrueNAS S3 failed but configuration backup was successful

  • April 10, 2026
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yonebayashi64

I tried to backup my VMs using Hyper-V via S3 compatible object storage repository where the destination S3 storage was configured on top of TrueNAS. I found that the configuration backup were succesful however the VM backup failed. The failure resulted in the following log. Thank you in advance. 

 

Task failed. Error: Unexpected common prefix: 'Veeam/Backup/Our-endpoint/Clients/redacted/Metadata/Checkpoint.Copy.0/', filter: '/Veeam/Backup/Our-endpoint/Clients/redacted/Metadata/Checkpoint' Failed to query folder on S3. Path: [/Veeam/Backup/Our-endpoint/Clients/redacted/Metadata/Checkpoint] Agent failed to process method {Cloud.FindLastCheckpointId}.
Processing finished with errors at 9/4/2026