Greetings.
Well, the only thing you wish to is to copy the entire game folder to the other USB drive... where ever. If you haven't been stypid and have followed the FAQ, all the save games are already in the game folders "Save" -folder what it comes to the newer OS'es, (you might want to go take a look just in case), the FAQ also guides on how to retrieve the saves that are not there.
As you can start the game from the drive or from anywhere else as long as you edit the baldur.ini to account the drive change and you need the BGMain.exe to start the game, as you also always need to start the game from the BGMain.exe(or the ToBEx starter), not the baldur.exe (as that starts the original front-end program which starts the game from the Windows registry, and if you copy the game, it's not installed nor registered in the computers registry, meaning that the game front-end actually gives you the option to to install the game, as your only option).
Yeah, read that again, there's several lines of though... but the main is: YES, copy the entire game folder... sorry I ramble. Ouh, by the way this is all in the in the pinned topic(the FAQ) it the megamod help forum, where this question should be... rambling, again sorry.
Edited by The Imp, 21 April 2013 - 11:49 AM.
Yep, Jarno Mikkola. my Mega Mod FAQ. Use of the BWS, and how to use it(scroll down that post a bit).
OK, desert dweller, welcome to the sanity, you are free to search for the limit, it's out there, we drew it in the sand. Ouh, actually it was still snow then.. but anyways.