> For the complete documentation index, see [llms.txt](https://docs.eazybackup.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.eazybackup.com/troubleshooting/windows-backup-encountered-an-error-when-writing-data-to-the-backup-target..md).

# Windows Backup encountered an error when writing data to the backup target.

During a Windows System Backup this error may appear in your job log:

`Windows Backup encountered an error when writing data to the backup target.`

The backup error is indicating that the Spool volume was not accessible, or there was an error writing to that device. This could mean the drive was detached or went offline, the spool device may be a failing. If this is a an external device check your USB cable.

If you are certain your spool volume is attached and working normally, run your back up again and see if the issues re-occurs. please contact support for additional assistance.

***

[eazyBackup](https://eazybackup.com)


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