Specify the name for the backup file, the extention (.zip) will be added automatically. By default, TeamCity will store the backup file in the
add timestamp suffix
Check this option to automatically add time stamp suffix to the specified filename. This may be useful to differentiate your backup files, if you don't clean up old backups.
Specify what kind of data you want to back up. The contents of the backup file depending on the scope is described right in the UI when you select a scope. Note that the size of the backup file and the time the backup process will take depends on the scope you select.
To reduce the resulting file size and the time spent on the backup, select the "basic" scope, which includes server settings, projects and builds configurations, plugins and database. However, you'll be able to restore only the settings which were backed up.
For the full backup suitable for most of the needs, it is recommended to use the Custom scope with all the items selected except for "" and then backup the <TeamCity Data Directory>/system/artifacts location as a usual file system.
Build artifacts are not included into the backup due to their size. It is recommended to either to backup the artifacts directories separately or use a redundant storage for storing the artifacts. Build logs are stored as a part of build artifacts, so there is no need to backup the build logs if you implement a separate backup of the artifacts locations.