As usually with TeamCity, agents perform upgrade / downgrade automatically.
TeamCity cleanup task is running on the main TeamCity server only. In two-node configuration as well as in single node configuration, it can work simultaneously while the build messages processor handles data from the running builds.
Backup & Restore
Backup through TeamCity web interface can be done on the main TeamCity server only. Backup from the command line can be done on either build messages processor or on the main TeamCity server.
Restore can be done on either of these nodes, but only if all of the servers using the TeamCity database and data directory are stopped.
- Only one build messages processor can be configured for the main TeamCity server.
- At the moment the build messages processor node does not support plugins.