Hi.

The difference is that a backlog should be an actively managed set of stories that are going to be developed, whereas a feature request list is a hold place for ideas. Some of the ideas will make their way into the backlog, when they are selected, but many ideas will sit on the feature request list for a long period of time, waiting for the day when you need to improve the product in a way that the feature can deliver.

The feature request list is a way of storing all the ideas, but once they’re written down, you can leave them until they are needed. Your backlog will be refined regularly and the features actually delivered.

Hope this helps.