I am new to Mac OS and have been using it since I got MBA 2011 a few weeks ago. One thing that drives me crazy is backup size by time machine. I have ~120Gb of data on the disk (250Gb total) and each (hourly) back up (that is supposed to be incremental) takes 10-20Gb. I use Time Capsule over Ethernet and backups go almost continuously. All I am doing is MS Word/Powerpoint, some Illustrator work and web browsing - no way I can have that much data updated every hour. I have 64Gb dedicated for VMWare - Windows 7 and it uses about 20Gb of disk space now. However, I turned VMWare completely off and it still does not make any difference. Is this normal for Mac OS (I hope not)? If not, what can I do to trace the problem? Thanks!