Yesterday I completed a 4 hour backup of my 64 Gb iPad on my 11" MBA. I started with 75 GB available before I synced and backed up my iPad and then checked it again after the sync completed and ended up with 67 GB available. I can't figure why I dropped so much storage after everything backed up. I checked my mobile sync folder and can only attribute 2.25 GB as my backup size for my ipad which means I lost an additional 5.75 GB and is being tied up somewhere on my flash drive. Could anyone please give me a suggestion or idea in how I can determine where the extra storage went?