Here's the setup: MBP (early 2011 - i5 4GB 320GB HDD) Time Capsule (2nd gen 500GB) MBP running latest Lion and latest Snow Leopard. Lion is used primarily, and has latest iWork, iLife and Adobe CS5. Snow has PPC/Rosetta stuff, mostly games. Snow disk usage is about 9GB, Lion is about 38GB, with 27GB just the iTunes library. The problem: when I do a Time Machine backup on either OS, th next time I run the other OS, I have to do a full backup. I assume it has something to do with the wireless MAC or something. Can anyone confirm this and/or instruct me on a solution?