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exFAT Filesystem may corrupt Veeam backup files

KB ID: 4233
Published: 2021-11-01
Last Modified: 2021-11-01

Challenge

According to recent discoveries in Veeam labs, in rare cases, Veeam backups may become corrupted when stored on the exFAT file system.

Cause

At the time of writing, the issue appears to be related to a buffer management issue in the exFAT file system driver.

There are no similar issues on other more popular file systems.

Solution

Based on the detection of this issue, we must strongly discourage using the exFAT filesystem for backup storage when attached to Windows 10 or Windows Server 2019 and later.

More information

This issue relates to the underlying exFAT filesystem where the backups are stored and can impact any Veeam products capable of storing backup files on such filesystem.

Veeam is working closely with Microsoft support to investigate this issue.

This article will be updated as further information becomes available.

KB ID: 4233
Published: 2021-11-01
Last Modified: 2021-11-01

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