The advanced tab has options for allowing multiple Exporters to run against the same export process. This way you can spread out the load of the export to gain efficiency. You can run multiple Exporters on the same machine or on separate machines. Fill in the Number X of Y where Y is the total # of Exporters running and X is which # this particular Exporter is.
Ignore document download errors - This setting allows you to ignore download errors. This is only useful when you know you have missing or corrupt documents that will cause errors during download. Turning this ON will ignore those errors and will allow Exporter to proceed without time-consuming retries.