Use only fresh data

1. What is the function of "Use only fresh data" in content generator,
2. The fresh data which you mention how many old month it will take
3. Whether I can set dates manually, eg: I need last one month data only.
2. The fresh data which you mention how many old month it will take
3. Whether I can set dates manually, eg: I need last one month data only.
Comments
2. that is all the data never seen before by the project
3. you can only do that when adding a custom source like google with date filter in parameters