1-800-691-1991 | 9am - 8pm ET

Backup of passive node of Microsoft Exchange Database Availability Group does not truncate transaction logs


Transaction logs do not get truncated after backup.
Microsoft Exchange VSS writer reports zero databases in its metadata on the passive node.
Microsoft Exchange Replication service VSS writer is disabled and it is not present in the list of VSS writers (vssadmin list writers) on both active and passive nodes.


Enable the Microsoft Exchange Replication service VSS writer. This VSS writer is enabled by default when you install DAG, however legacy backup software might need this writer to be disabled and that could be the reason why it was disabled manually.

Open Registry Editor and navigate to
HKEY_LOCAL_MACHINE\Software\Microsoft\ExchangeServer\v14\Replay\Parameters (Exchange 2010)
HKEY_LOCAL_MACHINE\Software\Microsoft\ExchangeServer\v15\Replay\Parameters (Exchange 2013)
Change DWORD value named EnableVSSWriter from 0 to 1.
Then restart the Microsoft Exchange Replication service.

More information

Discovered by:  Jason Matthews
Veeam Backup & Replication
Last Modified:
Please rate how helpful this article was to you:
5 out of 5 based on 1 ratings
Thank you for helping us improve!
An error occurred during voting. Please try again later.

Couldn't find what you were looking for?

Below you can submit an idea for a new knowledge base article.
Report a typo on this page:

Please select a spelling error or a typo on this page with your mouse and press CTRL + Enter to report this mistake to us. Thank you!

Spelling error in text

Knowledge base content request
By submitting, you agree that your personal data will be managed by Veeam in accordance with the Privacy Policy.

ty icon

Thank you!

We have received your request and our team will reach out to you shortly.


error icon

Oops! Something went wrong.

Please go back try again later.