You use the data loader for these following situations: B. When you need to schedule regular loads. C. When you export data for backup purposes. E. When you need to load records that are more than 50,000. If you are not familiar with what a data loader is, this is a type of application that is used in order to gather and download bulk data from a source.
This can be helpful for the three situations that are mentioned above. There may be different methods that will be followed depending on where you are getting the source from and where you are going to download the data.