KB1746: Log truncation issue on Microsoft SQL server
https://www.veeam.com/kb174604.04.2013 · By default, LOCAL SYSTEM account does not have log truncation rights on SQL 2012. In Veeam B&R v8: Starting with version 8, Veeam uses the account specified on “Guest Processing” tab in the job settings for log truncation. This user account may not have required user permissions for performing database backup or log truncation. Solution
SQL Log Truncation and Log Backup ... - Veeam Software
https://www.veeam.com/kb244723.02.2018 · Challenge After installing Veeam 9.5 Update 3, SQL logs are not truncated during backup, but the truncation task is still marked as a success in the job statistics. SQL Log Backup sessions complete with 0 KB transferred. You can confirm if any SQL VMs are affected by this change by checking the Guest Helper log located on the Guest VM.
KB1878: Exchange logs not being truncated - Veeam Software
https://www.veeam.com/kb187821.04.2014 · This KB provides information on items to check when logs are not being truncated, even when Veeam Backup & Replication is stating that everything is successful. Cause There are various causes for failure of truncation operations, both in the Veeam Backup & Replication application, and within the Exchange Windows guest itself. Solution