OPERATIONAL DEFECT DATABASE
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A job or task reports the error: There is not enough space on the disk
This error is relayed by Veeam Backup & Replication when the underlying system reports the error while attempting to write a file. More often than not, this error quite literally means the disk has insufficient free space. However, if it can be determined that the disk Veeam Backup & Replication was attempting to write to has sufficient free space, the issue may instead be related to a filesystem limitation or a configured disk quota. File system limits, file system quotas, or network share quotas can trigger this error. If the error is due to a file size limit, the job will always fail after transferring the same amount of data. If the error is due to a quota, subsequent job sessions will typically fail without transferring any data.
Identify what file Veeam Backup & Replication was attempting to create/write when the error occurred. Check if that disk has sufficient free space. Check if there is a filesystem single file size limitation. Check if a disk quota is configured.
TechNet: NTFS Disk Quotas
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