--- In [email protected], "Dennis Lipter" <blackca...@...> wrote:
> 
> Still don't know what backfill is.
> 

Data sources provide data in two primary ways:

1.   streaming realtime data  -  from the moment you connect to the source 
forward in time

2.   backfill data - historical data from some period in time prior to the 
moment you connect to the feed.  You can typically tell the feed how much 
backfill data you want (e.g. the last 6 months), up to some maximum limit 
imposed by the provider



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