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Do you mean that Rithmic stores historical on their own servers and Zen is stored on Ninja? In other words, yes to historical with Rithmic via their own servers?
I'm trying Rithmic thru Optimus Futures, and I get the same Historical data of Zen-Fire thru NT, Infact if i switch to Zen-Fire, that could be done only if u first disconnect from Rithmic (otherway u get this ), I have the same orders done on Rithmic, and if u try to load a Rithmic unsopported instrument like FDAX u get anyway the historical data.
So i think the historical data come always from Zen-Fire thru NT server.
Maybe @mattz or @NinjaTrader could clarify this.
Before I research this, I would like to give Ninja a chance to answer this because this is a highly technical question.
It would be nice of them to help one of their supporting brokers @ optimus ( I don't like these similes..but they do emphasize a point)
If they won't I will ask Rithmic directly
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It's an interesting question. Does Rithmic provide backfill, or not? Might need to also qualify that for which platform(s).
A quick google search suggests "No", they do not, just like their OEM counterpart Zen Fire. NinjaTrader has their own hardware doing backfill for Zen Fire, and they give this away to Ninja customers. But a Zen Fire customer using MultiCharts can't use that server, obviously.
This post suggests the backfill is in fact coming from Rithmic. It's almost worthless however, 1 day of ticks and 1 week of minute data (whereas Ninja+Zen provides about 1 year). But, it would suggest Rithmic does at least provide backfill in this very limited fashion. Perhaps @MultiCharts can confirm this again, that it is not a MultiCharts server providing this function but in fact Rithmic.
The ZenFire API allows ticks to be replayed, but the doc does not talk about how much data you can request. I do not see any interface for requesting min bar data. This interface does not go thru Ninja, so I would think that Zen stores todays ticks on the server and replays them if requested.
@Big Mike u can read it also here Supported Data Feeds, Zen-Fire and Rithmic provide the same amount of historical data. The thing is not reallyclear , on all this issue, is the relationships between Zen-Fire and Rithmic.
( I don't like these similes..but they do emphasize a point) 
