Comma- or space-separated list of file/directory names to exclude from backup. These apply across the entire backup.
For example, setting this field to war,plugins will allow you to avoid backing up "binaries" that you don't want to back up. But, this will also exclude any file/directory named "war" or "plugins" anywhere in Hudson's home directory.
If no value is specified, the whole content of the Hudson home directory will be taken into account.