Can I carry around Pokemon Insurgence on a USB?

Yeah. The save files should be found in your file explorer under C:\Users\[User Name]\Saved Games\Pokemon Insurgence. The save file 1 is labeled as Game.rxdata, save file 2 as Game_1.rxdata, and file 3 as Game_2.rxdata. The save files aren’t particularly large, so they will easily go in a flashdrive, or Dropbox, or Google Drive or what have you.

For more detailed instructions, you can check here.