Though the map archive may look big, it is only a small fraction of maps that are profusely distributed on battle.net. If you play UMS maps often, it's likely that you have over a hundred maps that the archive doesn't have already.
So if you appreciate being able to download so many rare maps and map packs, please consider uploading your battle.net maps so hundreds of other players may also enjoy the fun games you experienced
If you are interested, then go to C:\Program Files\Starcraft\maps\download (or similar directories) and zip all your map files. Then upload that .zip to a file host like Mediafire and paste the download link in this thread. I will download your donation and categorize them to the public archive