How to merge new values only?

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Using ArcGIS 10.3 Desktop.

We have a single feature class within our geodatabase which is a merge of all the other feature classes in the geodatabase. I would like to build a model that we can run everytime we input new data which will automatically take ONLY the new data that hasn't yet been merged in the other feature classes and merge those values with the existing "AllFeatures" feature class.

Is this possible? What tool(s) would I use?



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