The Nexus Mod Manager has my non-steam mod archives stored in C:\Games\Skyrim\mods. Do the archives I have downloaded contain redundant information, and do I need to keep these downloaded copies? Will the archives sorted by NMM be sufficient for the future?
As an answer to this question:
No, you do not need to keep the mod archive files that you have downloaded. NMM seems to make a copy of these archives in the directory you setup for each game. The archives you download from the Nexus or other sites can safely be deleted.