Most files related to modding are typically class/race/customization related by popularity, and involves basically editing text files. 90% of unoptimized mods are basically metadata rather than the mod itself, so filling up 2TB would be a massive feat :P
Just wait until some of the serious content creators decide it would be great to create the 3D assets for their own favourite city or region of faerun

When I mapped out Waterdeep in the NWN2 toolset, the basic areas came to 300GB+, even without adding much exterior content, building interiors, nor any of Skullport or Undermountain...