Unless you are a preservationist for the Internet Archive, you only need the highest revision number (Rev 2 > Rev 1 > Rev 0).

To give you a more concrete idea:

The Nintendo 3DS, a popular handheld gaming console, has an extensive library of games that enthusiasts want to preserve and play. A complete ROM set of 3DS games refers to a comprehensive collection of all the games released for the console, typically in ROM (Read-Only Memory) format, which can be used for emulation or other purposes. However, determining the size of such a collection can be quite complex due to various factors.

: Using a broad average of 450 MB per game for 1,672 titles, the base games alone would occupy roughly 752.4 GB , though this often excludes large AAA titles that push the total closer to the 1.5 TB+ range.

The file extension changes the math drastically:

If you are planning to archive the entire library, you need to prepare your storage space carefully. Here is the breakdown of the numbers, the formats, and what “complete” actually means.