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A Data Logger? Answered

I need to build a data logger for my project "Price Sign LED Display".
I can send program to the LED Control Card from various inputs like RS485, LAN (Internet and Ethernet), USB (File prepared in software and saved onto the Pendrive), and Wifi (through the mobile App). But whenever I send the data, it replaces the old content. Also it does not maintain any log of events. I want it to make a log and save it so that I can retreive this information as and when needed.

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