> 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/microsoft-sql-server-backup-encountered-a-vdi-error.md).

# Microsoft SQL Server backup encountered a VDI error

You should ensure that the necessary VDI `.dll` files are registered and are the correct version for your SQL Server installation. You can use [Microsoft SQL Server Backup Simulator](https://github.com/Microsoft/tigertoolbox/releases/) to check the status of the VDI `.dll` files.

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