KB1878: Exchange logs not being truncated - Veeam Software
www.veeam.com › kb1878Apr 21, 2014 · The Veeam Backup & Replication job is not configured trigger truncation. The VSS operation occurring during the job is not notifying the Exchange VSS writer that a backup has occurred. The Exchange VSS writer is receiving notification that a backup has occurred, but an issue within the Exchange software prevents truncation.