KB2029: SQL Transaction Log Backup - Veeam Software
https://www.veeam.com/kb202927.04.2015 · When backing up an Always On availability group's nodes it is best practice to have all the nodes in the same job.. Veeam Backup & Replication will display the warning related to this KB if it detects that the server being backed up is part of a SQL Always On group and another node in that group is already being processed by SQL Transaction Log Backup.