Downloading 3TB of data to play 5 games is madness. Look for a "curated" set (Top 100 games) which is only ~30GB. One Final Weird Fact The Nintendo 3DS Camera app (the gray icon on your home menu) is actually part of the "complete set" as a system title. It is 300MB. There are 14 different versions of this app across regions. That is 4.2GB of storage dedicated entirely to a camera app nobody uses.
But that’s like saying a car has "four wheels." The interesting part is what makes up that 3TB. Unlike a NES or SNES set, the 3DS ecosystem was fragmented. A "complete set" can mean four different things: 3ds Complete Rom Set Size
If you’ve ever looked into archiving the entire Nintendo 3DS library, you’ve probably heard conflicting numbers. Is it 2TB? 5TB? Why do some sets have 1,000 files and others 10,000? Let’s cut through the confusion. The Short Answer (The TL;DR) A truly complete , unmerged, decrypted 3DS ROM set (including all regions, updates, DLC, and demos) is approximately 2.5 to 3.5 Terabytes (TB) . Downloading 3TB of data to play 5 games is madness