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Let me remind me you that your final novel does not need to include every bit of information you have compiled. The fact that you have additional information (like backstory) is beneficial to your...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27861 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Let me remind me you that your final novel does not need to include every bit of information you have compiled. The fact that you have additional information (like backstory) is beneficial to your novel even if you don't include it, simply because it's going to allow you to do a better work rounding up your characters. Thus, even if you don't include it, that extra work is not lost. What I would do in this case: I would concentrate on the main plot and include only as much of the subplot in question as is necessary to enrich the main plot. Later, when a complete draft you like is finished, you can still decide whether to include more of that subplot or not, depending on the total length. What you don't get to use of the subplot doesn't need to be published right away. Just keep it in your drawer until there's a suitable occasion to use it. Who knows what the future holds!