Significance of 'Days Back' field in SQL datasource

Hi,
I have a 'days back' as one of the field in the view from where i'm extracting data to an ODS. I have it set for selection. I don't have any IO associated to it in the ODS. What is the significance of this field?
I have run a full load around a month back. I want to do a delta load. I guess if I don't put any values in the 'days back' field in the infopackage, it won't make any difference and the delta load will load properly. If i put values like 0-5, would it only transfer data upto 5 days back?
Please let me know if there is any documentation on this.
Regards
Sameer

If this is a custom extractor then you are, of course, on your own ...

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