I have been using Skydrive to keep file synced between my laptop and desktop for over a year now.  I just finished updating my desktop to windows 8.1 and noticed my network utilization was high.  I found that the culprit was Skydrive; it had decided to create a copy of and subsequently upload every file in my skydrive folder.  In some cases, it made more than one copy (appending the desktop name twice) even on files I had not opened in several months.

I have encountered duplication before when it made sense, such as accidentally editing a word document on both computers.  However, the current behavior seems very likely to be some sort of bug.

The base file (without any computer names appended) is listed as available "online only" while the files with the most names appended is listed as available offline.  I am therefore guessing that if I delete the files with the computer names appended, I will have to re-download all my files from the Skydrive servers.

Edit:
Desktop is running Win 8.1 enterprise x64
Laptop is running Win 8.0 enterprise x64