SkyDrive in Windows 8.1 has a secret weapon no one’s talked very much about. It’s actually pretty amazing, in that small sort of way that doesn’t change much, but still manages to completely alter how you use something. In fact, it might just make SkyDrive the best cloud service around. If you install Dropbox, SkyDrive, or even Google Drive on your desktop today, you’re going to sync the whole of your folder to your drive, at once, and keep all the files there whenever they’re synced. If you don’t have enough space, tough. Delete something you don’t have synced to the cloud, or just stop syncing. SkyDrive has a different solution. Microsoft calls this its “secret sauce”. Basically, SkyDrive makes files and folders you store in the cloud behave as though they’re stored there anyway, without taking up space on your computer. You can browse, inspect, and even preview them, even though the whole file isn’t taking up space on your drive.